He's one of our great brains. We like great brains. And Elon has done a fantastic job." President Trump talks with Tesla and SpaceX CEO Elon Musk at the White House on Feb. 3, 2017. Evan Vucci / AP ...

Elon Musk’s decision to go all in on Donald Trump never made much sense. His scorched-earth approach to breaking up with Trump is even harder to square.

For all the insults that Mr. Musk and Mr. Trump traded on Thursday, don’t be surprised if they make up again days from now. In the meantime, they both benefit.