You still haven’t explained how Kylo being redeemed comes at the expense of Rey and Finn’s stories. You’re taking that as a given, when I’m here not understanding what that even means or how that’s the case at all.
You also sort of misunderstand my point about identification, and it being for kids. People identify with Kylo. He’s not just “the bully” for people. They see themselves in him. For a kid to be see themselves in him, and then for the conclusion to be that they’re really just an irredeemable monster is fucked. Obviously SW is not just for kids, and the myth should stand on its own. But even in that sense it’s a terribly boring conclusion for a character to die evil.
As for fascism, the character is explicitly separated from the FO ideology. On the one side we have the fanatic Hux who seems more in charge of the machinery of the FO. On the other, Kylo, who’s really just shown to be with the FO because they’re the bad guys/dark side. His story is separate from that. TLJ sets up an interesting conflict where Kylo is now Supreme Leader, but doesn’t work well with people like Hux who have their own goals. If you see him as alt-right, that’s a you problem, and is not one very well supported by the film.
Star Wars is a lot of things. Political to some degree, sure, but that’s never been the whole point. SW characterization shouldn’t suffer at the altar of a political message. A SW story should be something more timeless than just trying to take a dig at a shit head like Ben Shapiro. It’s bigger than that, it’s more universal than that. You can say that SW can and should evolve beyond what it’s been, but at some point you’re asking for it to be something that it fundamentally is just not. When you’re talking about a conclusion to a trilogy, and a nine episode saga, you’re not talking about the right time to just wholeheartedly abandon some of the most prominent themes of the series. Forgiveness and redemption. Seeing the good in people. Learning from failure. Saving, not fighting. Freedom of choice. Hope, always.
To put it simply, what you’re asking for is something that is at its very core antithetical to all that Star Wars has built up. It’s not Star Wars, and thank god it doesn’t exist, trashy as TROS is, at least they understood what Kylo meant. Even if it was the only story they got vaguely right, it’s at least something. To make him an irredeemable villain would have been character assassination on par with Rey Palpatine. So I guess in that sense it’s surprising they didn’t do it, considering all the other awful decisions made.