I think his intense commitment to getting Trump elected makes more sense when you consider this article.

His enormous wealth is largely stored in the form of Tesla stock, and that stock has been valued based on the belief that it isn't a car company, it's a robotaxi service currently selling the hardware to finance the software development. The value -- and his wealth -- can persist indefinitely as long as investors continue to accept that premise, no matter how long delayed. But if something tangibly undermines that premise, Musk could conceivably lose the majority of his wealth overnight.

The National Highway Traffic Safety Agency is probably the greatest threat to his wealth. He doesn't worry about competitors or protestors or Twitter users or advertisers. They're all just petty nuisances. But the federal regulator over roads... that is his proverbial killer snail. And I think fully capturing the entire federal regulatory state is his strategy to permanently confine that snail.

More than anything else, I think that's what is motivating his radical embrace of fascism.