The reason a reactionary, cyclical analysis of politics is wrong isn't because "muh fascism" or "muh morals", it's because it doesn't account for the fundamental systemic changes wrought by the capitalist mode of production. A single dictator can't control anarchy of the system.
The dictatorship is one of the bourgeoisie as-a-whole. The reason I liked Trump is because he illuminated that. He ripped the mask off the horrible ruling class, and exposed the inability of populism, left or right, to turn a capitalist dictatorship into a meaniful democracy.
He had a few counter bourgeois impulses re war, borders, and tariffs, and despite riding in executive driver's seat, he couldn't do shit. They went full HAM against him from the jump, & he wasn't even a major threat to anything. The bourgeoisie's grip on power isn't weak.
We just watched them run an election where "Socialists", Republicans, alt-righters, dissident nrx people, and ultraleftists, were all backing Biden and shitting their pants about a Trump coup. They burned half the country down, and locked down the other half just to secure a win.
The Republican Party is a shell of its former self, because the mere threat of Trump style divergence from the neoliberal order caused half its flunkies to run to the Democrats, including Charles Koch & half the Bush administration. The realignment is over. A new GOP will emerge.