US doesn't have the resources to give every one of the hundreds of thousands of individuals interested in blowing up a chunk of Americans a full blown 8 month trial, 3 hots and a cot, and loving handjobs twice per week.

As in all things in life there's a tradeoff between "justice" and "security". Luckily for you and most of the people in this thread, you get to benefit from the actions of people who have to make that call, while looking down on them from your moral high horse in your comfortably AC'ed parents' basement.