The commentary I've read on 9/11 this weekend split into two categories. One viewed the terror attacks as a one-off event, never to be seen again, and unrelated to the other wars being fought by the USA (other than being used as a pretext). The healthier versions of this focused on "getting on with our lives" rather than obsessing over a disaster. A reasonable approach to a random disaster, I'll grant.
I'm with the people who see 9/11 as one part of a war, a big war. We want to keep our own way of life. That's an offense to the Islamofascists who think that everyone should live by sharia law and under a muslim dictator ("caliph"). As long as there's an "Islam will dominate the world" crowd and thousands of people chanting "Death to America" we're going to stay at war. Because they're going to keep trying, and as incompetent as most Islamfascists are, sometimes they will get lucky. So we have to keep the pressure on and keep them fighting as far away from our homes as we can. If we can enable some Arab democracies that could start the culture changing into one that can coexist with us.
Alternatively we could take the Ghengis Khan approach to the war and keep slaughtering until there's no one left with the nerve to suggest attacking us. I don't want that many deaths on my conscience unless every other approach has failed. Unfortunately if we pull back and let the enemy regroup and try a new attack on their own schedule we may find ourselves reduced to that approach.