for being politically correct or just knowning not much we tend to put the equal blame on weaker party as much as the stronger party as well.
when people say Muslims are killing Muslims .. they are sadly wrong because in all cases you pick up.. it is Only one specific sect (a mutated form of Sunnis) that is killing everyone else. when they dont have F-15s then they use suicide bombers and masked terrorists who go around executing people. when they DO have F-15s then they drop bombs on everything and get Bentleys as a reward (sorry for the political statement yes I am biased because my country has been affected by a group of sect that follows certain Arabian country that is bombing Yemen at the moment and cursing Syrian regime at the same time for doing the same)