I think they somehow conflate 'moral right' with 'factual right'. And therefore 'moral wrong' with 'factual wrong'.

Yeah. I think that's what's happening and there's certainly historical precedent in European society for this type of fanaticism and almost blind moralism. The Jews closely studied our dispositions and designed subversive approaches that would work with our temperaments.

My gut instinct is that what drives all the collective delusion is the constant exposure to all the disunity and filth. Whites like order, cleanliness, clear rules, high trust, goals, positive growth, hard work, fair laws. The disharmony of our multiculty western world does a number on high trust Europeans. These ideological whites that constantly see poverty and disorder can only double down on the 'approved' explanation: systemic racism and centuries of evil white oppression. The alternative (that blacks are simply incompatible with western civilization and especially white people) is unthinkable to many whites. Our white nurturing and community building has been exploited to foster a parasite. Except the host doesn't know it has a parasite.

which literally depicts Floyd as an angel complete with wings and a halo), his being beyond criticism (any mention of his crimes is simply 'racist'), and so forth

If you get a chance make sure to check out that David Cole article I posted. He mentions this phenomena and tries to figure out why it's happening.