BLM the organisation has far too much politics about it, 'blm' on the other hand - the movement, has very little to question about it and is I think what most people support. It's a real problem for the 'supporters of lives', in that to discern what type of supporter or non supporter of blm/BLM you are, there needs to be a full 15 page questionnaire to undertake.

That's frustrating, but I think it is safe to assume that people taking a knee in solidarity are doing so to support black lives mattering (under the assumption that all lives matter), rather than the very left wing political campaigning/huge donations, which is not made (purposefully?) particularly obvious.