Why would ISIS do that? Hamas has done it and achieved desired effect - Israeli reaction to the act of terror with sequential condemnation by many countries of the Israeli responce. ISIS wants unification of Muslims under their banner into Khaliphate. Having terror act in Israel only unite Israelis in their fight against terror and will validate Israel in the eyes of the world.
Why would ISIS do that? Hamas has done it and achieved desired effect - Israeli reaction to the act of terror with sequential condemnation by many countries of the Israeli responce. ISIS wants unification of Muslims under their banner into Khaliphate. Having terror act in Israel only unite Israelis in their fight against terror and will validate Israel in the eyes of the world.