ISIS sprang up and took root in places where the U.S. destabilized and/or toppled a sovereign government that was perfectly capable of dealing with radical Islamic elements within its borders. They also flourished with the tacit support of the U.S. government in these places.
Assad has always been anti-Israel.
He is partnered with Russia and Iran.
Iran is one of the largest “terrorist” sponsor states. And they support Great Evil.
Admitted. U.S. has chosen partner’s poorly in the recent past in the Middle East. Largely under Obama.