Elon Musk said Donald Trump should be impeached and that he was covering up his ties to an accused sex trafficker. Mr Trump said Mr Musk, whom he had put in charge of eliminating waste and fraud in the government, had ignored the easiest way to do the job, cutting his own government contracts. He also said Mr Musk had lost his mind. Do any of these accusations matter? Probably not, at least not nearly as much as they seemed to at the time, lo these few days ago, when they were riveting national and even global attention.