It's always been about slavery for this subset of the population, right from the very beginning of the formation of the country. Not just money, not just power in an abstract sense, but the kind of power that only comes with slavery.
The fascism is only a means to slavery. They'll take it as far as they're allowed.
Many of these things are timed to take full effect after Trump's term. Republicans in Congress expect the next president to be a Democrat and for that person to take all the heat if they do nothing to stop it, to have to raise taxes to offset the cuts, or to incur additional deficit spending. Republicans can campaign effectively against all three, and Republican voters will lap it up like hogs at the trough.