This is a no win proposition. Their approach is horribly flawed, despite the appropriateness of the statement being made.
And, in the end, we need BART to remain around (because if they were actually competent enough to organize even just a one-day boycott, that would cripple BART financially). We just need their police to be less murderous. On that note, why not go after the division responsible for hiring BART police?! It's totally fuckall.