[notahacker]

He isn't an engineer but does have considerably more willingness to listen to and understand engineers than the rest of the administration.

If nothing else, he's aware that there's a bit more involved in getting humans to Mars on any timeline than just rockets, and slashing the budget of the only entity working on those problems might not speed up getting there...

If course, he also knows enough to know nobody's sending manned missions to Mars in the next launch window regardless of whose in charge, and he's been quite fond of breaking stuff recently so I'm not sure we want Elon in charge either.