Your less controversial example doesn't quite map, though, because climate change is something that can be tested and observed; like you said, you can construct

Your less controversial example doesn't quite map, though, because climate change is something that can be tested and observed; like you said, you can construct experiments at home to help people understand it. There's no experiment I can construct that helps people understand that black people are people too. There's no science I can point to which establishes that women should be treated the same as men. There's no journal I can cite that explains why Jews don't deserve to be rounded up and exterminated. Stuff like that is axiomatic; I can't construct a logical argument to show you that people deserve to be treated like people, it's just the case. If you think that some subgroup of humanity is less than human, I'm probably not going to be very effective at changing your mind; any counterexample I show you can be written off with "well, they're some of the ~good ones~, but it's all the others who are the problem". Change really has to come from within on this one. And I think your extreme example of our president kind of works in my favour, as opposed to yours. Trump said and did (and continues to say and do) a lot of extremely heinous shit. We have him on video discussing how much he loves to assault women, and how they just let him do it. And instead of saying "No, that's not acceptable, full stop. This is wrong and people who do this are wrong", there was a lot of "oh well it's just boy talk, they were just chatting like boys do in the locker room, it wasn't really sexual assault because he said the women let him do it", and it turned into a debate about whether or not sexually assaulting women is wrong and whether or not bragging about sexually assaulting women is wrong. And now Trump is president, despite the fact that he habitually sexually assaulted women and is proud of the fact that he habitually sexually assaulted women. By providing a platform for logical debate of something that is heinous, the heinous action gained legitimacy and ended up being okay.