If you disagree, I would argue you have a very sad view of the world, where truth and cooperation are inferior to lies and manipulation.
(This is, I think, an apolitical observation: whatever you think about Trump, he is arguing for a pretty major restructuring of political power in a manner that is identifiable in fascism. And Musk is, pretty unarguably, bankrolling this.)
2) the leader of only one of them is threatening to lock up journalists, shut down broadcasters, and use the military against his enemies.
3) only one of them led an attempted autogolpe that was condemned at the time by all sides
4) Musk is only backing the one described in 1, 2 and 3 above.
It's not really arguable, all this stuff.
The guy who thinks the USA should go to Mars clearly thinks he's better throwing in his lot with the whiny strongman dude who is on record -- via his own social media platform -- as saying that the giant imaginary fraud he projected to explain his humiliating loss was a reason to terminate the Constitution.
And he's putting a lot of money into it, and co-running the ground game. But sure, he wants to go to Mars. So it's all good.