He's already said he's basically going to be 10 times worse if he gets reelected. I'm not sure why the people who support him think that's a good thing. For a party that claims to love "freedom" they sure seem desperate to elect a fascist dictator
He didn't want the folks who would pay him to suddenly believe they didn't have to pay, or be ticked off that they were having to pay (remember, rich folks can get snippy). I can't remember the number that was floated, but it wasn't cheap.
There are several different groups supporting him for different reasons. The biggest, I'd argue, is the slightly right very populist. They're not into fascism per se, they just want a wrecking ball like Trump to go in and break apart the elite institutions they blame for all the problems and see no other way of influencing. There certainly are supporters who are encroaching on fascism territory. Then there's long time Republicans who have flipped on a bunch of issues to try to get support from these people Trump activated.