I wish it weren't called BLM. It would be better understood, and would not divide and lead to marginalization the way it has. It's gaining a big upswing right now, with people accepting the premise that it should not be interpreted to mean that any other lives don't matter.
The funny thing about this is that the assertion, to someone who doesn't think it needs to be stated, is going to sound like it's saying more because they don't think it needs to be stated. You don't go around just pointing obvious stuff out. "The street is on the ground". "The sun is bright". "Dave Matthews Band sucks!" These things are just known to be unimpeachably correct. The only reason why you'd
start stating the obvious is if it meant something non-obvious. BLM (the name) is the equivalent of this:
Likewise, for people who don't automatically assume that black lives matter (racists I mean), they'll use it to mean black supremacy because it fits their narrative. Either way the name is bad for winning people over. What it's designed to do, and is successful at doing, is motivating people who are already believers.