Very few of them said that and those that did say it said it weeks later. If you don't remember (but I do), the first few days after 9/11 almost EVERY American was ready to nuke the Middle East. As time went by the libs lost their patriotic fervor and returned to their former selves - but those first few days were different.
And the muzzies took note. I doubt Al Qaeda will try another large-scale attack (although the UK airplane plan was just such a one). Why risk enraging the American beast with a spectacular act, when the attrition war is going so well and Americans are turning on each other?