Tesla commands high brand awareness, consideration and loyalty, and customers are mostly delighted by its cars. Musk’s antics, on the other hand? They could do without. Before it was reported Musk had an affair with Sergey Brin’s wife, which he’s denied; before his slipshod deal, then no-deal, to acquire Twitter Inc.; before the revelation he fathered twins with an executive at his brain-interface start-up Neuralink; before SpaceX fired employees who called him “a frequent source of distraction and embarrassment”; before his daughter changed her name and legal gender after his history of mocking pronouns; before an article said SpaceX paid...