Lets see, I don't have any numbers concerning civilian deaths from the World Wars, but I'm guessing that based upon the scale of the wars they dwarf this one.
I doubt you'd have found many Europeans after the wars who, despite the casualties, weren't thankful to the US.
Give it time. Unfortunately, the quality of life there sucks. I don't argue that. But, assuming we stay our course and political infighting within the US doesn't weaken our resolve, the quality of life there will improve.
War should only be used when necessary because it is a traumatic, devastating tool to alter the world. But it is necessary in times, and one should not shy away from it when it is necessary. To argue the necessity of it is the correct thing to do, but to simply complain about its aftermath is childish and simplistic. There is nothing good about war itself, so by its own nature, to judge it based upon its immediate consequences would lead one to believe that all wars are wrong.