For the billionaires controlling Trump, the Republican Party, it's all just about money and power. The original Fascists used Capitalism to advance Fascism. With these guys, it's the other way around.
As for the MAGA cult, the average working-class people who vote for Republicans, it's really just anger and hatred. They're angry at the world, but if they can make someone else unhappy, then they feel a little better for a couple minutes.