I think there is an honest debate here for the tech side of the house and its implications/risks/etc, but my point is, I think, more broad than 'will we move too fast elsewhere'. I worry he will bring twitter like problems, 'free speech is important, if it is approved by me', to space and Mars. I can easily imagine a future where the Moon, Mars and space are accessible, so long as you are approved by Musk to be in space. That gets to my core point, do we want Musk to be that gatekeeper? Do we want him deciding who and what can go to space and where they can go.