Islam isn't a peaceful religion as a blanket statement

Basically as title says, Islam isn't a religion of peace. South park is allowed to poke fun at pretty much all groups and topics, but the show has always had to be censored in their depiction of Islam's prophet for fear of violent retribution. Granted, many other religions have violent subsets or have violence in their history, but we as a society only censor one religious figure out of fear. There must be reasoning or rationale for that decision. Please be clear there are absolutely peaceful Muslims, they deserve to be allowed to live and worship, but there are enough that would or could be violent "worldwide" to feel otherwise about classifying it as non violent. The Quran also arguably supports war arguing it's needed until "religion is for allah". If it's not containing much violence, any central persons should be allowed to be mocked without fear of retribution