Yes, aware you were responding to Born and not me. But you did rather accuse me of all sorts of similar unpleasantness in several of your posts.
You suggest in your post that 'race' was the biggest factor in those events. I was originally asked whether 'racism' was the biggest factor in those events. Those are different things. But no, I'm not sure whether 'race' was the biggest factor in all those events. It may have been. In the Rodney King case, for example, men in uniform don't need an excuse to beat up a civilian. That happens in every country in the world, and is rife in many African countries, for example. The officers who beat up Rodney King were charged with assault and using excessive force. None were charged with racially aggravated assault, so there must have been no evidence that 'race' or 'racism' was a factor when they were prosecuted. Was 'race' or 'racism' a factor in the jury finding them not guilty? I don't know. I don't think anyone can know, except the jurors themselves.
This focus on 'common decency' I think is the central issue. I don't think that is a constant, which you seem to be suggesting it is. Over the past 1000 years - 'common decency' was that women are the property of their husband and should not have the vote; that children should have no rights of any kind; that animals should have no rights of any kind; that public execution and torture of criminals is appropriate; that any form of sexual behaviour other than between a man and a woman who are married is a sin; that any child born outside marriage is a bastard; that Empire is a great thing, white people are born to rule the world and the rest of the world should know their place, etc. Only really very gradually in the 19th and 20th century did 'common decency' start to change towards something we might recognise as 'common decency' today in 2024. And even today, there is still much disagreement about what constitutes 'common decency'. I am not sure if I place that much weight on 'common decency'. And it is also not a constant across cultures. What constitutes 'common decency' in Sweden, may not constitute 'common decency' in Saudi Arabia.
What I would suggest is more of a constant is the untrustworthiness of those in power. And how the educated class and the institutions that you so praise act in their own interests and not in the interests of those they claim to serve. Those holding power tend to use it for their own ends. I would suggest that is pretty much a constant over the past 1000 years. The same people who for a 1000 years told us white people are born to rule the world, are now the same people telling us diversity is a strength. Is it because those who rule us have suddenly morally evolved? I don't think so. I think it is because telling us 'diversity is a strength', and the mass immigration and low wages that comes with it, serves their interests. And you seem entirely comfortable giving those in power the right to control what we say, and therefore, what we think. I don't call that progress.