re: With ISIS carving out more territory each day, why haven't they attacked Israel?

ISIS's game is to go after failed states. They go where organized, competent armies and unsympathetic populations aren't. That's why they're picking a fight in the power Vacuum of Eastern Syria, in anarchic Libya, in the Sunni territories of Iraq, and against the Kurds. Israel is too organized for them to fight at this point. ISIS needs more men, more armor, and fewer unconquered foes in the field before they can even think of challenging Israel.