ISIS has attacked Israel via the Egyptian Sinai border via missiles. The main reason they do not attack Israel is that they are preoccupied with other battles within Syria, Iraq and Souther Egypt. In addition, ISISI would have no chance against the IDF. In addition, Israel provides humanitarian medical support to Syrian people via the shared border, they also provide medical support to Palestinian civilians despite the hostilities . Trying to pin Israel of supporting ISIS is utter conspiracy bullshit, do you really think extreme Muslims would work together with Israel?