Don T -

I doubt that the "real religious leaders of Islam" have much more control over the "clerics who spout hate and bile" than the Catholic (Vatican) church had over the "deviant Catholics" in Germany in 1933. The Vatican was the first major political power to make a treaty with Natzi Germany, and the main original reason for the treaty was to get rid of the "liberal Catholic" (deviant) contingent in Germany. The attempt to "control" deviant believers led to some significant curtailments of freedom of just about everything in that case.

Google the "Concordat of 1933" for some opinions.

John