By all accounts, ISIS is more concerned with “purifying” the areas under their control then they are with getting into a fight with Israel. Besides, they consider Hamas to be ‘apostates’ and fighting Israel is by their reckoning, pretty low on their list of priorities.
I think anything inspired by Satan will hate Israel. Name any one of those groups. Their hatred for Israel is palpable. They teach their kids that. Sure, they will continue “purifying” that region, but if they could score a victory against Israel and the West, it would be their “crown jewel.” They don’t show any signs of stopping any time soon.