Buddhism may be more peaceful compared to the rest but it's still not flawless. The only difference is that most Buddhist violent is internally directed against other Buddhists. Certain Tibetan monasteries for example have been known to war and commit genocide against other monasteries.
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In Myanmar Buddhists persecute Muslims
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It's only those Tibetan and Indian/Pakistani Buddhists that stain the reputation of the other Buddhists Then again, those Vietnamese ones are kinda....iffy...