The conclusion of Christopher Hitchens's article on the upcoming anniversary of 9/11:
The battle against casuistry and bad faith has also been worth fighting. So have many other struggles to assert the obvious. Contrary to the peddlers of shallow anti-Western self-hatred, the Muslim world did not adopt Bin-Ladenism as its shield against reality. Very much to the contrary, there turned out to be many millions of Arabs who have heretically and robustly preferred life over death. In many societies, al-Qaida defeated itself as well as underwent defeat.
In these cases, then, the problems did turn out to be more complicated than any "simple" solution the theocratic fanatics could propose. But, and against the tendencies of euphemism and evasion, some stout simplicities deservedly remain. Among them: Holocaust denial is in fact a surreptitious form of Holocaust affirmation. The fatwa against Salman Rushdie was a direct and lethal challenge to free expression, not a clash between traditional faith and "free speech fundamentalism." The mass murder in Bosnia-Herzegovina was not the random product of "ancient hatreds" but a deliberate plan to erase the Muslim population. The regimes of Saddam Hussein and Kim Jong Il and Mahmoud Ahmadinejad fully deserve to be called "evil." And, 10 years ago in Manhattan and Washington and Shanksville, Pa., there was a direct confrontation with the totalitarian idea, expressed in its most vicious and unvarnished form. Let this and other struggles temper and strengthen us for future battles where it will be necessary to repudiate the big lie.
Hitchens states the obvious (which may be virtuous, but more often than not unproductive when the goal is to refuse that even stout simplicities lead to uneasy complexities) in an ideological manner. He does it to avoid posing the tough questions, and be on his high horse when he refuses to acknowledge that in life, politics or in any aspect of life being on the right side, fighting 'evil' doesn't make things simpler, but more complicated because it means that there is a duty to act as if only the final result matters for the other side is evil.
Hitchens fails to understand the question is never in the characterization of evil as evil, but in the uncomfortable notion that stating it doesn't solve anything and does make things simple.
In short, 9/11 did make life, the world easier, it make it more complex because the 'evil' of the act was so obvious that reflexion and the morality of political acts mattered more tha ever before.