Sometimes you have to convince the skeptics that the government has considered such tactics in the past:

http://georgewashington.blogspot.com

It has now been persuasively argued -- as shown, for example, in this History Channel video -- that Nazis set fire to their own government building and blamed that fire on others... The fire was the event which justified Hitler's seizure of power and suspension of liberties.

And in the early 1950s, agents of an Israeli terrorist cell operating in Egypt planted bombs in several buildings, including U.S. diplomatic facilities, then left behind "evidence" implicating the Arabs as the culprits (one of the bombs detonated prematurely, allowing the Egyptians to identify the bombers). Israel's Defense Minister was brought down by the scandal, along with the entire Israeli government. See also this confirmation.

And the Russian KGB apparently conducted a wave of bombings in Russia in order to justify war against Chechnya and put Vladimir Putin into power.

This is called "false flag terrorism", where a government attacks its own people then blames others in order to justify its goals
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Well, as shown by this BBC special (which contains interviews with some of the key players), it is probable that America knew of the Japanese plan to attack Pearl Harbor -- down to the exact date of the attack -- and allowed it to happen to justify America's entry into World War II. ...And -- most stunning -- the FDR administration took numerous affirmative steps to ensure that the Japanese attack would be successful.

And, as confirmed by a former Italian Prime Minister, an Italian judge, and the former head of Italian counterintelligence, NATO, with the help of U.S. and foreign special forces, carried out terror bombings in Italy and blamed the communists, in order to rally people’s support for their governments in Europe in their fight against communism.
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Moreover, recently declassified documents show that in the 1960's, the American Joint Chiefs of Staff signed off on a plan to blow up AMERICAN airplanes (using an elaborate plan involving the switching of airplanes), and also to commit terrorist murders against U.S. citizens on American soil, and then to blame it on the Cubans in order to justify an invasion of Cuba.
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Therefore, before you dismiss as a tinfoil hat conspiracy claims about 9/11, please take a look at the historical record.
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Australia's largest newspaper quoted the well-respected former Indonesian president as saying that the government had a role in the Bali bombings (apparently, Muslim governments play this game as well)

And according to the London Times, "The man accused of supplying the dynamite used in the al-Qaeda train bombings in Madrid was in possession of the private telephone number of the head of Spain's Civil Guard bomb squad . . . . The revelation has raised fresh concerns in Madrid about links between those held responsible for the March bombings, which killed 190 people, and Spain’s security services".