First, your premise is crap. The Righties do not support and defend fascism, which essentially is gov't control of the economy and the country. I.E., big gov't and an enormous amount of red tape, regs, and rules that hamstrings private business, and that is the goal of the Left, not the Right. Which party wants to spend more money than the other? The Democrats, EVERY TIME. The Democrats want to control damn near everything from healthcare to education, to energy (climate change) to housing and on and on.
The problem may be that the Left and the Right have a different definition or interpretation of what fascism is. IMHO, it's basically a totalitarian form of gov't where the citizen's rights are subservient to and dictated by the state. It's fair to say that Trump has some fascist tendencies, but it's also fair to say that the Right did not allow him to enact those tendencies, much to his dismay. He wanted to abolish the filibuster so he could get his policies passed through Congress, true? Just like the Far Left wants to do today. And there was talk back when Obama was president of doing the same thing then. All of which to me is a step towards fascism from both the Left and the right when they are in power, trying to accumulate and cement their political power. When I see the Democrats howling about the filibuster and packing the courts and admitting Puerto Rico and DC as new states and I see them trying to pass legislation to control state elections, all of that is fascist in nature that I do not see the Right wanting or doing.