There is a significant number of Muslims who justify murders like this through hateful preachers who emphasize the most violent and intolerant passages in the Quran. Much of this crap is based on the Saudi funded Wahhabi  tradition which spills easily over to violent Jihad.  Muslims will either root this out or they will not. Too many politicians in the Muslim world exploit this intolerance for their own political benefit or at best are afraid to face it down.