I am just learning of some stuff like cancel culture. Why do you consider that unhinged? It looks to me like people protesting behavior they consider objectionable. That culture seems fine. You might object to how they go about it, but the concept seems okay.
I took issue with the comparison (between them and alt-right) precisely because I see them as fundamentally different and incomparable. One is essentially overcorrecting, aka, good intentions, whereas the other is literally about causing serious harm to entire groups of people. They'd be counterparts if they advocated, say, the displacement/eviction etc of White people as 'reparation' for historical wrongs done to non-Whites.
That said, there are serious problems with this crowd. Stuff like #metoo tends to a kind of mob justice and in some way, it even seems to target black men a lil more harshly than White guys. But, just as a matter of principle, I consider slogans like "Believe women" to be incredibly dangerous bs. Women lie too, they are not idiots or saints. We came up with courts and the concept of evidence to sort things out when two people make contradictory claims for a reason. Anything else is highly regressive. They even try to cancel comedians for crying out loud: Tried to do it to Chapelle late last year and it backfired bigtime coz he's too popular, but would've destroyed his ability to do comedy if it was someone else.
My other issue with it, besides the capacity for ruining actual lives on someone's word alone, like has happened to many college boys (when girls decide
after sex that they weren't into it, after all), is its weaponization. No better example than Elizabeth Warren trying to #metoo Bernie Sanders with that 'He told me women can't win' bs that even MSNBC were like, Come on. Dude asked you to run for president in 2015 and only ran after you refused, campaigned for Hillary, and is on tape decades ago saying women can be president when it wasn't a social score. It's basically a bat people swing disingenuously at opponents in politics. So, no, I do not consider college kids screaming at speakers on their campus or protesting on behalf of minorities to be in anyway comparable to the alt-right, but I have a ton of criticism for them, especially those I consider fake SJWs, as in, using it for political mileage only but don't actually give two cents about minorities.
I think you downplay the racist aspect of Republicanism too much. It's out in the open. The only thing not happening are public lynchings. alt-right is the underbelly of the Republican party. There are probably differing degrees of it. But the tolerance for it is almost universal. "I am not a racist, even though I pretend not to see it because I look away when it happens" seems to be in play for a lot of the "moderate" Republicans.
It wasn't this bad during GW Bush, but even then you knew what Republicans are about. No, they won't say their party hates minorities obviously. But they do and say things where you know what they are about, just as surely as any Kenyan knows what Kimunya is about when he says "NSE is not a fish market". The audience understands the polite fiction.
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IMO the non-whites on the right are just outliers. In many cases, they serve as useful foils to legitimate accusations of racism.
Yes, it's gotten more mainstream, that's for sure. And it's possible it's older (re the Kimunya fish example), but I also know conservatives who are terrified that if the SCOTUS goes super left, there will be jailings and future persecution for cultural conservatives. For this reason, they'll vote for anyone who promises them conservative judges. Everything else is less important to them. Now, I don't know what percentage this group is, maybe it's just 5%, but they exist. I don't consider people like George Bush racist, for example: his sins are of a different sort, corporatist warmonger is what he is. But dude tried to push immigration reform and did some good things for Africa's HIV fight, and his family have latinos in them.
Re non-White Republicans, besides paid shills like Candace Owens, many non-Whites on the Right are there for either cultural conservative reasons or they are Tea-Party ideologues like Ben Carson (He's obviously both, though), IMO. They aren't the majority group.