We will of course encounter numerous 9/11 comments and opinions for what are fairly obvious reasons. For me, personally, one of the simplest and clearest is the article in Slate by Christopher Hitchens. He nails it with two words … “Simply Evil” …
A decade after 9/11, it remains the best description and most essential fact about al-Qaida.
The proper task of the “public intellectual” might be conceived as the responsibility to introduce complexity into the argument: the reminder that things are very infrequently as simple as they can be made to seem. But what I learned in a highly indelible manner from the events and arguments of September 2001 was this: Never, ever ignore the obvious either. To the government and most of the people of the United States, it seemed that the country on 9/11 had been attacked in a particularly odious way (air piracy used to maximize civilian casualties) by a particularly odious group (a secretive and homicidal gang: part multinational corporation, part crime family) that was sworn to a medieval cult of death, a racist hatred of Jews, a religious frenzy against Hindus, Christians, Shia Muslims, and “unbelievers,” and the restoration of a long-vanished and despotic empire.