Your mistake is in assuming uniform treatment is actually the goal. People have mostly publicly given up that pretense, and now there are plenty of explanations

Your mistake is in assuming uniform treatment is actually the goal. People have mostly publicly given up that pretense, and now there are plenty of explanations for why fairness isn’t enough and we need to actually have a preference for <group> to <do moral thing>. And even that is just a pretense at some level; most of this stuff is actually politics that has little to do with its stated or even first-order-revealed preference.