Fine don't arm ISIS... you'll just arm some other group we haven't heard of yet and that group will be the next big "terrorist threat." When we gave weapons to al Qaida and the Taliban in Afghanistan they were fighting our enemy (the Soviets) when we gave weapons (including WMD) to Saddam he was fighting our enemy (Iran). When we gave weapons to the groups that later assembled as ISIS they were fighting our enemies everywhere (Saddam, al Qaida etc.) Now we are giving weapons to "moderate rebels" in Syria to fight our enemy (Assad/Russia/ISIS)... anyone want to guess where the next big well armed hostile extremist movement is going to come from? I'll take your bets.