Elon Musk, who’s taking his chainsaw to the federal government, is not merely a chaos agent, as he is sometimes described. Jill Lepore, the best-selling author of “These Truths” and other books, says that Musk is animated by obsessions and a sense of mission he acquired through reading, and misreading, science fiction. “When he keeps saying, you know, ‘We’re at a fork in the road. The future of human civilization depends on this election,’ he means SpaceX,” she tells David Remnick. “He means . . . ‘I need to take these rockets to colonize Mars and that’s only going to happen through Trump.’ ” The massive-scale reduction in social services he is enacting through DOGE, Lepore thinks, is tied to this objective. “Although there may be billions of [people] suffering here on planet Earth today, those are miniscule compared to the calculation of the needs of the billions of humans that will one day ever live if we can gain escape velocity from planet Earth. . . . That is, in fact, the math that lies behind DOGE.”  Lepore’s BBC radio series on the SpaceX C.E.O. is called “X-Man: The Elon Musk Origin Story.”