The most common response that I am met with when i talk to friends about conspiracy theories like 911 being an inside job or that Princess Diana was killed by MI6 and the establishment and various others is that people say "I can't believe that our leaders would be evil enough to commit such atrocities."
But what i would like to say to that is all you have to do is look at history, hasn't it been proven that generally those in power have consistently commited evil acts especially too those who are considered to be their subjects like for instance the Roman emperors giving a thumbs-down to comdem contestants in their games and Kings and Queens at the snap of a finger having anyone they wished be-headed or hung who they considered to be a problem or threat to their grip on power. As well as various society's sacrificing people to whatever god's they followed to appease them.
So what makes anyone think that those in power today would be any different to those in the past because as the quote says "Power corrupts and absolute power corrupts absolutely.". What people have to got to realise is democracy is just for show because it doesn't matter who you vote for, the government still gets in and the politicians in the various parties are actually controlled by hidden masters behind the veil and that those in power have moved from being soo overtly to covertly so we are given the impression that the Queen now holds little say over the running of the country because the decision making is down to our elected "Servants" like the prime minister but I ask you why is it that every new law still needs the monarch's blessing before it can be passed and also just like the American President, Prime Ministers aren't elected, they are selected usually because they are a member of some elite blood-line, for instance George W Bush was a 14th cousin of the British Queen as well as his father George H Bush, the following is taken from wikianswers-
George W. Bush isn't the first American president to be related to a previous president. Many former presidents were distant cousins, especially during the first 100 years of the Republic when the country's population (and the pool of likely candidates) was much smaller than today. Even Herbert Hoover and Richard Nixon were distant cousins.
JOHN ADAMS (1797-1801) and JOHN QUINCY ADAMS (1825-1829) were, like the Bushes, father and son. John and John Quincy Adams were also great-grandfather and grandfather (respectively) of the historian and author Henry Adams.
WILLIAM HENRY HARRISON (1841-1841) and BENJAMIN HARRISON (1889-1893) were grandfather and grandson. The elder Harrison is famous for the brevity of his term: he died after one month in office, the victim of a bad cold contracted at his inaugural.
THEODORE ROOSEVELT (1901-1909) and FRANKLIN D. ROOSEVELT (1933-1945) share a famous name but were only distantly related: they were fifth cousins. Teddy Roosevelt was more closely related to Franklin's wife Eleanor, who was his niece. (She was the daughter of Teddy's brother Elliot.) Bonus relatives: Martin Van Buren was a third cousin twice removed to Theodore Roosevelt, and Zachary Taylor (1849-1850) was a fourth cousin thrice removed to FDR. The Roosevelts were the only two presidents in this loop (to date) to serve more than one term.
GEORGE BUSH (1989-1993) and GEORGE W. BUSH (2001-) are separated only by the two terms of Bill Clinton, who defeated the elder Bush in the elections of 1992.
As you can see from the above power is kept within the family on most occasions and also most modern British Prime Ministers have attended Bilderberg meetings at some point, below is a list from wikipedia:-
Tony Blair (1993), Prime Minister 1997–2007
Gordon Brown (1991), Prime Minister 2007– 2010
Edward Heath, Prime Minister 1970–1974 (deceased)
Alec Douglas-Home (1977–1980), Chairman of the Bilderberg Group, Prime Minister 1963–1964 (deceased)
Margaret Thatcher (1975), Prime Minister 1979–1990
As well as the following powerful people in american politics and Europe:-
Thomas E. Donilon (2012), Executive Vice President for Law and Policy at Fannie Mae (1999–2005), Current National Security Advisor for The White House.
Roger Altman (2009), Deputy Treasury Secretary from 1993–1994, Founder and Chairman of Evercore Partners
George W. Ball (1954, 1993), Under Secretary of State 1961–1968, Ambassador to U.N. 1968 (deceased)
Sandy Berger (1999), National Security Advisor, 1997–2001
Timothy Geithner (2009), Treasury Secretary
Dick Gephardt (2012), former Congressman and House Majority Leader
Lee H. Hamilton (1997),[better source needed] former Congressman
Christian Herter, (1961, 1963, 1964, 1966), 53rd United States Secretary of State (deceased)
Charles Douglas Jackson (1957, 1958, 1960), Special Assistant to the President (deceased)
Joseph E. Johnson (1954), President Carnegie Endowment for International Peace (deceased)
Henry Kissinger (1957, 1964, 1966, 1971, 1973, 1974, 1977, 2008, 2009, 2010, 2011, 2012), 56th United States Secretary of State
Richard Perle (2011), Chairman of the Defense Policy Board Advisory Committee 2001–2003, United States Assistant Secretary of Defense 1981–1987 
Colin Powell (1997), 65th United States Secretary of State
Lawrence Summers, Director of the National Economic Council
Paul Volcker[when?], Chair of the President's Economic Recovery Advisory Board and Chairman of the Federal Reserve from 1979–1987
Bing West (2010), author and former Assistant Secretary of Defense for International Security Affairs
Robert Zoellick (2009–2012), former Trade Representative, former Deputy Secretary of State and former President of the World Bank Group
Bill Clinton (1991), President 1993–2001
Gerald Ford (1964, 1966), President 1974–1977 (deceased)
John Edwards (2004), Senator from North Carolina 1999–2005
Chuck Hagel (1999, 2000), Senator from Nebraska 1997–2009
John Kerry (2012), Senator from Massachusetts 1985–present
Sam Nunn (1996, 1997), Senator from Georgia 1972–1997
Mitchell Daniels (2012) Governor of Indiana 2004–present
Jon Huntsman, Jr. (2012), Governor of Utah 2005–2009
Rick Perry (2007), Governor of Texas 2000–present
Mark Sanford (2008), Governor of South Carolina 2003–2011
European Union Commissioners who have attended include:
Frederik Bolkestein (1996, 2003), former European Commissioner
Neelie Kroes (2011), EU Commissioner 
Pascal Lamy (2003, 2010), former European Commissioner for Trade, Director-General of the World Trade Organization 2005–present
Peter Mandelson (1999), (2009), former European Commissioner for Trade 2004–2008
Pedro Solbes (2010), former European Commissioner for Economic and Financial Affairs, former Second Vice President of Spain, former Minister of Economy and Finance
The Bilderberg meeting was first held in 1954 in a hotel that gave it its name the hotel de Bilderberg and is an annual gathering of the elite and powerful where those who seek to control the world are rumoured to get together to discuss and plan the policies that are going to shape the world in the future regardless of nation or soverenity and who are also behind the decisions of what governments are going to be overthrown or what national leaders are going to be assasignated that end up being descibed as conspiracy theories by those who believe that those in power would never do no wrong.
It is said that the world is in fact run and controlled by as little as 5000 persons or roughly about 0.001% of the population and most of these are part of or related to just 13 families or bloodlines and is it a conindance that the same people who control the banks and financial world are the same people who run and own or are in positions of power in the media companies, the big corporations, the pharmaceautal companies and the arms companies and it is a fact that 90% of the world's wealth is in the hands of just two percent of the people.
And to be honest it actually makes sense that power is kept close at hand and by a chosen few because who with power wants to relinquish it and risk appointing an outsider to be for instance chairman of the board of one of their companies who might make decisions that differ from what is wanted and for the benefit for the many instead of the few, instead they appoint lackey's who they know will follow their wishes and who don't have any empathy for common man and can easily make decisions in the various industries that will maximise profits even if it is at the detriment of mankind as a whole for instance in the media only covering and pushing stories that are out and out lies and support the agenda and instantly ridicule any journalist or reporter who starts to write or speak about their being an element of truth behind what is labeled various conspiracy theories or in the drugs industry bringing out new medicines for various illnesses and diseases which are no better than the ones allready available but with more side effects and in fact suppressing medication that could cure things like cancer and Aids Suppressed Cancer Cures because there is more profit to be made in treating the symptoms of these diseases than actually curing them, or in the arms industry manufacturing and selling weapons that are just plain evil like for instance using substances such as depleted uranium in bombs and missals and marketing things like cluster bombs which are designed to not just kill people or blow up targets but to actually wound and maim as many(and usually innocent citizens) enemy's as possible
Don't you think that if the world was being run and decisions made by those in power for the benefit of all people on the planet rather than the elite select few they would do a better job of it and make choices that avoid things like wars and financial collapses and all I ask you is to be aware of when happenings happen who actually benefits from them and to realise that if we don't wake up and actually hold those who are deemed to serve us responsible for the atrocities they commit and decisions they make then we are heading towards a New World Order run by a global totalitarian Global Government with a one world currency whose agenda is imposed by an one world army and once we are in it it will be too late to speak out about it
"First they came for the socialists,
and I didn't speak out because I wasn't a socialist.
Then they came for the trade unionists,
and I didn't speak out because I wasn't a trade unionist.
Then they came for the Jews,
and I didn't speak out because I wasn't a Jew.
Then they came for me,
and there was no one left to speak for me."