I don't think you understand their platform very well. Police bias, which is a real thing, is only the tip of the iceberg when it comes to the structural racism issues they care about.

You might like to consider how public spending for lead abatement correlates with demographics. Flint, MI is an obvious starting point for your inquiry.

I'm very supportive of BLM, which is not the same thing as an endorsement of every single thing everyone in a BLM shirt or at a BLM event has ever said. Just like any networked attempt to disrupt the status quo, there will be a certain number of missteps, mistakes, pivots, and so on. The fact that BLM is a social rather than technological undertaking doesn't make it so different from any other kind of startup.