I've been hearing internet rumours of theories that for a lot of people all of this has something to do with fragile masculinity, a desire for dominance, sexual insecurity, something like that. I don't really understand it fully, but it's something like they want to bring back old sexual hierachies so they can be at the top of them. Machoism. They want to bring the manly jobs back and give them to white people. The reason they hate black people is they have some insecurity about being sexually out-competed by black men. The reason they hate gay and trans people is that nontraditional sexuality devalues the whole traditional sexual hierarchy. The reason they want to crash the economy so there won't be as many jobs available and women will have to depend on men for money which will make it easier for them to get women - some of them have actually said this out loud! And so on.

It's just one of many possible theories, but it's consistent with itself and the evidence...

Not sure where exactly I've seen the idea. It might have been: https://www.youtube.com/watch?v=Bn6b8GRAXgo or its source material: https://www.youtube.com/watch?v=ID8Xq3chNi4