system
A chat on subreddit /r/NoStupidQuestions
human
Yeah. BLM was never meant to mean that no other lives matter, but it still spawned group who countered the movement by staying "all lives matter"

It's not that the message that all lives matter is negative in any way, it's just the context in which it's used.
gpt
"Save the whales" doesn't mean, "fuck the dolphins."

As a tangential note, the thin blue line is dumb. You know how I know Blue and Red Lives Matter? Every time a cop/firefighter dies on duty, main thoroughfares are closed down and firefighters raise their ladders with the giant American flag at each overpass.