Comment by quadrifoliate

The founders of the Black Lives Matter Global Network Foundation are Marxists in much the same way that the founders of the United States were slavery advocates. That is, both statements are true, but somewhat incidental to the core idea.

If you reject the thought that the United States has slavery built deeply into its ideology, then you should award that same consideration to BLM and admit that the fundamentals of its ideology are not Marxism etc., but that Black people are fundamentally not given a fair shake by society, as you say.

This is leaving aside the point other posters have made, which is that Black Lives Matter as a slogan and idea exists outside this specific foundation. I don't think you can reasonably expect someone asserting "Black Lives Matter" to have made a complete study of this specific foundation and be in agreement with all its aims.