Not all threats are created equal, nor are all responses to a threat. And while this indeed did start off as a response to a threat I maintain that the response is so vastly disproportionate that the response itself is a greater danger to Americans.
Americans kill between 50 to 100 Muslims for every American a Muslim has killed. I allege that the reason America has Muslim enemies is because of America's support for regional tyrants and because of this whole killing Muslims habit it has.
Furthermore, the people being killed right now are often people who are fighting the American invasion of Afghanistan from neighboring Pakistan and America was not facing a hotbed of attacks from Pakistan's tribal regions until it went to Afghanistan and played nation building. The Pakistan problem is a consequence of the Afghanistan invasion, Americans faced virtually no threat whatsoever from Pakistan's tribal regions until America started killing people in the region.
I think that Al Qaeda represents a negligible threat to America right now and think that America is killing Muslims at a rate that represents a level of disproportionality that ensures American enemies for subsequent generations.
Sometimes you can don the mantle of self-defense and act in a manner that makes you less safe. That is precisely what I allege America to be doing, even though I understand that the initial motivation was self-defense.