Maybe ISIS is intentionally trying to sucker the U.S. back into Iraq. Maybe Putin is orchestrating this to help take the focus off him trying to rebuild the old Soviet Union. It's the ultimate game of chess.
Putin is orchestrating the US funding, training, and equipping terrorists to fight Syria, which Putin himself said that he won't allow to become "another Libya," i.e. another country the US has regime-changed via bombing their government and arming foreign-based terror groups against the regime.
Is this what you actually believe?