ISIS , is a religious political group I guess ? But there's one other political group that is conjoined by religion , the Israelis .
If you're sane you should know that world war 3 isn't a necessary thing . To accept the idea that ww3 is inevitable is creating it . Just everyone pull out of the middle east , the world war will be fought by the people that create the situation , we will just clean up .
The Israelis should have known their position , the United States has no contract to back Israel in illegal warfare . So Israel will have to deal with other factions , like sympathetic Islamic states , or Russia , and China .
Pull everyone out , let the cleansing happen over the wound , not all over the body .