Mr. Musk and Mr. Trump did not have a feud five days ago and might not have a feud five days from now. Until proven otherwise, all of this is theater. Think of it as the political version of professional wrestling. For a few hours, everyone was diverted by the spectacle of a brawl between the world's richest man and its most powerful person.

Mr. Trump took a break from tariffs and deportations. For Mr. Musk, the episode was even more valuable. His wealth comes from the promise that Tesla, his electric car company, will own a significant slice of the self-driving future. The launch of Tesla's robotaxi business is next week in Austin. Skepticism abounds. The more attention it gets, the bigger a disappointment it could be.

Mr. Musk's SpaceX business is even more problematic. For all its promise to set up colonies on Mars, it is having trouble with the basics. The ninth flight test of SpaceX's Starship program a few days ago saw both the reusable booster exploding and, 40 minutes later, the rocket itself blowing up. It wasn't the first such failure either.