In the early 50s in the US, there was what was called McCarthyism and the only reason it succeeded was that there was no resistance to it. When they tried the same thing in the 60s it instantly collapsed because people simply laughed at it so they couldn't do it. Even a dictatorship can't do everything it wants. It's got to have some degree of popular support.
Noam ChomskyThe Japanese bombing of Pearl Harbor led to many very good things. If you follow the trail, it led to kicking Europeans out of Asia - that saved tens of millions of lives in India alone.
Noam ChomskySeptember 11 shocked many Americans into an awareness that they had better pay much closer attention to what the US government does in the world and how it is perceived. Many issues have been opened for discussion that were not on the agenda before. That's all to the good.
Noam Chomsky