The mainstream news reporting on Portland (and other regional rioting) got to the point where they were bald-faced lying about peaceful protests standing in front of burning buildings. The most charitable interpretation I can think of is that these professional journalists think that their readers can’t understand a nuanced world of gray and need everything reduced to black and white. There can be a concept of “BLM”…
For starters I'd suggest not putting black lives matter in capitals since that acronym covers both the tautological expression as well as the Marxist organisation which has taken this moniker. Yes, lives matter no matter the colour of the skin, why do you ask? No, I will not support the organisation which has co-opted the name since they only use the name to further their political agenda.