These condemning Muslim clerics are only condemning Assad's regime because Assad is a heretical Alawite which is allied with heretical Shi'sim. If he was a Sunni Muslim, they would keep their mouths shut. They never said anything against Saddam Hussein who killed far more people than Assad. It is simply hypocrisy.
Islamic State militants blow up ancient Arch of Triumph in Palmyra (Reuters)
from the article: Arab states, top Sunni clerical body condemn Syria as crackdown mounts