There is no longer anything to be gained by pursuing this conflict, if there ever was any gain to be had. Killing people prematurely might give us a little psycho-boost, but why bother? They will die anyway.
The economics of modern warfare favor some sector specific companies, but no longer provide the bread and bullet boost of the 20th century conflicts. The US economy is obviously worse off due to the inefficiencies of modern warfare.
The humanist argument really sucks. Why we persist in believing we can beat
humanity democracy capitalism subservience into people is mystifying.