It's not because of BLM. It's because of Prop 13.
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But also the focus on equality of outcome instead of equality of opportunity.
I read a good book a while back that pointed out how much more we spend on special ed, which is aimed at the bottom 5%, compared to what we spend on gifted education, which is the top 5%. It asked why we would spend so much on one and not the other, especially since the ROI is so much higher for the top 5%. (It obviously skipped the whole "making our society better and helping those in need" argument since it hurt their argument).