Not trslly a "critiquez' -- just a gentle suggestion for being more explicit about it. Too many white people believe merely supporting #blacklivesmatter is sufficient to make one an ally. Of course, it's more supportive than NOT recognizing the movement as essential, but that it takes a hell of a lot of work evidenced in actions as well as words.
I have the feeling that you may be just a wee bit defensive, but you don't need to be.
Your points are well taken. My words are just a bit of tinkering with yours, and 100% supportive of your argument. ;-)