This is one of the dumbest things BLM supports say.
The VAST majority of Ted Kaczynski's life was peaceful. He was violent less than 1% of the days he lived. Does not make him peaceful.
The majority of the Jan 6th protesters were peaceful. Does not mean Jan 6th was not violent. The vast majority of police encouners are perfectly peaceful. I guess that means the complaints from the BLM protesters was unfounded.
Hell the vast majority of KKK rallies are peaceful.
At the end of the day, we do not use this asinine excuse that any org is 'mostly peaceful' as a cover when violent riots are occurring at their protests.