The world is in an uproar over Islamic State (not just killing a few American reporters, but large scale massacres of various Muslim minorities, non-Muslims, and massive sexual crimes against non-Muslim women). Do you expect the US to launch an invasion of the Middle East, from which the US was driven out just a few years ago?
Hardly driven out. Obama simply was fulfilling his campaign promise against the advice of American military leaders. And Obama fed the rise of the Islamic State with his foolish refusal to arm the moderate Syrian rebels early on in the conflict. He is on the verge of doing the same in Afghanistan.