Serious answer? Because Susie Soccer Mom and Joe Student who make up the overwhelming majority of the current voting populace don't understand the necessity and presence of violence. Middle America thinks that all war is bad, and trying to get them behind going full-force into the middle East is political suicide after 13 years in Afghanistan, and 10 in Iraq. Joe Student thinks you're just there for oil and your imperialistic conquests, MAAAANNNNN. Susie Homemaker thinks that through proper diplomatic relations and international aide, we can defeat hatred.

And the fence-sitters, elderly, and veterans aren't too keen on the idea of having more of our boys lose life and limb for people who beg for our help, then turn around and sell us out to the MB/AQ/ISIS/Taliban. I understand, without condoning or condemning, to quote Osterman.