@WeBuiltThisBuffetOnSausageRoll
See, I think of someone like James Watson, who advocated aborting those of low intelligence, among other things, as pretty much the epitome of that. People don't talk about ignoring his scientific insights, though.
Wow - that's far worse than Blyton, although I think she still holds her end up where authors are concerned. With her, it's just so casual and nonchalant.
Staying with scientists, Charles Darwin is another one: people tend not to mention his belief that white men were the most evolved of the species and that women, black and Asian people were inferior specimens. I know that millions of others have held these prejudices throughout the centuries, but he actually proposed it as scientifically-provable theory.
Well yes, but he would have to - if he thought it was true, it would presumably have a scientific explanation.
There was a lot of scientific racism at that time, but I'm not convinced we are that far from it now. Look at dog breeding in it's modern carnation - it developed at the same time from the same ideas, that is when the KC was founded. It's principles say that by breeding for the best specimen of type without mixing you will get the best, most perfect, dogs. (And the founders of the KC were all very involved in the eugenics movement - they were different manifestations of the same idea.)
We now know that scientifically that is untrue, that kind of "purity" is neither very helpful, or even all that real. But many many people still believe it about dogs. Identity politics has also brought back the spectre of race essentialism to a scary degree.
Part of the problem of othering the people who had these ideas, and failing to acknowledge, or even really look into, why they might have found them compelling, is that it allows us to imagine that we are very different in our thinking. Often that's not true, and so bad ideas go unrecognised. It's much safer all round when we recognise that a lot of morally questionable ideas are in some way very compelling, and good smart people may fall prey to them.