I was at the end of school during the 2016 election and my closest friend in my Comp-Sci class who I'd known from 11 was in the far right pipeline; this person found Hillary absolute abhorrent, loved trump and was generally the 2016 Pepe style crypto-facist. We live in the UK too, so this is even less common than it probably was in the USA.
When school ended, I stopped speaking to this person, but a few years ago saw that she's come out as a trans woman. I'm happy for her and not really keen to reconnect at all, but oh boy am I nosy about the timeline of her political views. I wonder if she still holds them, was struggling with internalised issues or just had a huge realisation at some point.
There's a book called Tabletop Role-playing Therapy: A Guide for the Clinician Game Master by Dr Megan A. Connel that's a really standout resource about this, she appeared on the official D&D podcast a year or so ago talking about it.
I'd say that this is more a resource for therapists to use TTRPGs than it is for DMs to act as therapists for their players. There's a fine line between accommodating your players' preferences and needs and providing unwanted therapy; if you want to actually put any therapy techniques into your game, ask your players approval first.