I have some thoughts:
Trump is a unique case, and least in the modern era, seems to have a core set of voters thats overwhelmingly devoted and resistant to influence from external sources for a variety of reasons, mostly, I think due to his ability to manipulate the media and his symbiosis with Fox, which has a similar philosophy and approach to building its brand.
Trump won the 2016 election in large part by giving voters enemies to blame, Muslims, globalists, liberals, Democrats, the deep state, Mexicans, intellectuals, academics, millennials, the media, Hollywood, coastal elites, etc., and while he built a pretty powerful voting block, it was based on core ideologies that are disdained by a lot of institutions and that, along with a lot of things he's said and done, and the fact that a majority of Americans have issues with these things and in turn with those that support them and him, IMO, have likely increased, rather than decreased the number of "closet Trump supporters, who feel like they can't or shouldn't express their political views in public for family or professional reasons, or even on Facebook or other non anonymous social media.
SW is a natural place for these folks, like others who feel like they have stuff they want to express anonymously, and through blocking as well as the general tolerance (believe it or not) of SW and even other disimmilar users ,they seem to be able to have found safe spaces, as well as places to fight as keyboard warriors, and just be themselves without recrimination or real world condemnation.
And here, where they often do outnumber other users active in the politics section, they not only feel more secure, but powerful and free to be like they can't be in the real world, which, of course, sometimes includes emulating Trump style bullying and bragging.
This is just my theory of course, and I have friends here, some of whom are Trump supporters who don't fit in with the theory much at all, or who, like myself gravitated to SW for completely non political reasons, but I think it does help explain some of what you're describing.
I don't see as much of here in other sections/topics, but on EP, there were an awful lot of different groups that formed communities, like the transgender, cross dressing and fetish crowds and even the "Other Woman" groups which could provide support as well as other things.
