It’s not just the BLM movement that ignores this fact, the media suppresses it entirely. For all the media mentions “disproportionate this, disproportionate that” this is a disproportion that is never mentioned.
Also, why don’t protesters demand equality in media coverage. On the day George Floyd was murdered, there were probably a few dozen other murders in the country. Why do they get no coverage at all in the media. Do their lives matter?