It is the obligation of every state to enforce the law of nations. This means there is a universal legal responsibility to support Israel’s ongoing counter-terrorism operations in the Middle East. Though it may appear that these operations sometimes break humanitarian international law, it is the jihadists’ use of human shields and location of military facilities within schools and hospitals that is responsible for the resulting harm to civilians. These actions, which constitute a violation of international law called “perfidy”, threaten not only Israel but the global legal order itself.