All of these protests, the BLM ones over the summer and the one on January 6th in DC were "mostly peaceful" by any definition of mostly and peaceful. Only the BLM protests got the "mostly peaceful" treatment from the media.
What is the strawman? Using statistics in this way is meaningless. Hell, I'd bet by area the capitol hill riots were mostly peaceful. The capitol complex is a large place and I'm certain 51% could be defined as peaceful under a similar definition that burning neighborhoods were this summer.