I think modern Elon is too jaded about reality/fat with cash to still believe in saving humanity. He certainly doesn’t talk about it in the frequency and light he used to.
Why would you think he ever believed in that rather than it being a personal and corporate brand marketing tactic the way it has been for so many other startups and their CEOs, to the point of being frequently mocked?
Really I only believe that because he’s consistently shown he’s sufficiently disconnected from reality that legitimately believing he can single-handedly save humanity seems par for the course.
