I'm not saying it's not those people, they're definitely a large part of it.
But conservatives are definitely on Lemmy. Just try talking about minority rights anywhere and watch them seep out of the cracks in the pavement to suck all of your energy out.
I think anyone defending the American ruling class and the Palestinian genocide is conservative, whether they like conservatism lite or full on fascist conservatism, it's still conservatism.
But the full on fascist conservatives are definitely here too, they just know to cloak their attitudes in hidden language. Any attempt to point out racism, misogyny, homophobia or any of those things that's been casually accepted will get a certain small group of people really pissed about it. I've definitely encountered some men's rights activists.
It'd be foolish not to expect it. They explicitly do entryism on "normie" forums all the time. It's a stated strategy of theirs.