Tibetan Buddhism wasn’t so friendly:

squabbles between or within Buddhist sects are often fueled by the material corruption and personal deficiencies of the leadership … But what of Tibetan Buddhism? Is it not an exception to this sort of strife? … A reading of Tibet’s history suggests a somewhat different picture. “Religious conflict was commonplace in old Tibet,” writes one western Buddhist practitioner. “History belies the Shangri-La image of Tibetan lamas and their followers living together in mutual tolerance and nonviolent goodwill. Indeed, the situation was quite different. Old Tibet was much more like Europe during the religious wars of the Counterreformation.”

I don’t know that this is that surprising. Nice to know we’re all as likely to murder each other as anyone else.