We do what we can, when we can. The optimal solution is to look for the ant mounds beyond our own yard.
The enemies we face are not interested in agreements or treaties - only that if we are not exactly like them, we should die. They also have no issue with killing themselves to kill us... With this, I have no idea why so many people in the world (including the majority of Americans) hate what we are doing. Would they or you rather see us doing nothing just waiting to be attacked again?
We taught the terrorist that their techniques can work – America, possibility the weakest pre-nation on the earth in 1776, defeated one of the greatest militaries of all time by using many of these same methods. In Vietnam, we lost because of this (this and our own media) - but all we lost was one foreign country… We could lose this as well, but the consequences will be significant world wide and right at home.
* The ant analogy is an interesting one because it is only ants and humans that go to war with each other.