They prefer to kill each other in their Jihad wars than to kill infidels.
Arab wannabes - Malaysians, Indonesians, Africans - are even more illogical. Signing up with ISIS to kill Shia Muslims in Iraq and Syria.......
But then, the Israelis are also just as illogical - they provide supplies to Gaza on one hand and rain rockets on them with the other hand...
USA also mad - providing cash, weapons and training to Syrian rebels who are allies of ISIS......
Only Russia seems to have a clearer aim in their foreign policies.....sell weapons to all sides.