That Level 3 sex offender we were discussing? Anyone can go the site "Heavy" and get his story. His own girlfriend said he was never into the BLM stuff and has no idea why he was there to begin with.
As jd would affirm (if he's honest), there was also Antifa present at this and other BLM protests. Their objectives only "sorta" cross with the motives of BLM.. think "venn diagram" or however it's spelled.
I don't claim the other two white dudes were affiliated with Antifa (no idea), but it's definitely not far-fetched to claim there are groups that piggy-back their own intentions or motives upon other protests just because the other one is receiving attention or legitimacy, and so show up at protests, and often do more radical acts, for other reasons than the official one.
I see your point as well. Plenty of BLM supporters are indeed white.