The depravity of its followers stems from the ideology itself.
Sheik Yer’Mami: (PBUH)
The Mohammedan Weltanschauung is stooped in dualism; holding two opposing things true at the same time. And pretending that there is some other kind of Islam, one that differs from that of the Koran, sirs and hadith, is basic taqiyya. The jihadists do exactly what Muhammad did, and the so called “moderates” pretend they are doing something wrong, here the Arab media even calls it “despicable actions that tarnish Islam”. The reality is that nothing can “tarnish Islam” more than Islam itself.
H/T: Cecilie Gamst Berg