The problem is that it's systematic "oppression" (for lack of a better word) against "poor" people and a large number of them are black people plus the racial biases that are all wrapped in it all as well. And that's why you end up with threads like this.
I think this is generally how policing works in the modern day where the perceived "oppression" isn't actually oppression, just law and order in low income communities that are used to race bait and push political agendas. If you go into low income neighborhoods, they despise police as if it's their fault that they need to enforce the law.
The "intent" of BLM was to draw intention to how black people bare the brunt of that "oppression". It was a poor choice of a name as we've seen because the other groups that also get the short end of the stick so to say pipe up and say.. hey.. what about the shit I go through.. my life matters so all lives matters.. and on and on it goes and people get so wrapped up in arguing about a stupid name as opposed to focusing on the real issues and just getting the shit done.
BLM as a organization was founded on illegitimate means anyways. Their whole spiel was that police were killing African Americans in droves and they started their organization on the Michael Brown shooting which was completely justified. The Obama Department of Justice looked into the case and found that the officer was in fact assaulted by Michael Brown and killed him in self defense yet BLM continue, to this day, try and claim it was an act of racism. Black lives do matter because every life matters. The BLM group is not well motivated and their message doesn't make any sense which is why "All lives matter" even became a thing.