There’s an interesting corollary of that: multiple “Black Lives Matter” organizations believe in ending capitalism and dismantling the family. By your argument,

There’s an interesting corollary of that: multiple “Black Lives Matter” organizations believe in ending capitalism and dismantling the family. By your argument, nobody should use the phrase “black lives matter” either unless they, like the founders of that BLM org, actually are literal Marxists. Maybe you are a Marxist and you think it’s a grand idea to abolish capitalism and the nuclear family. But actually, effective communication is a little beside the point here. If you effectively communicated that you wanted to abolish capitalism and the nuclear family, nobody would care or pay attention. If you instead hid those ideas under a slogan specifically chosen to be as undeniable as possible, you can sneak a lot of things in pretty fast.