Comment by tinym

I had a bramble of related ideas in mind, and instead of putting in effort to untangle them I lazily let them came out as a pithy aphorism. But:

- Even if all of Musk's enterprises were aimed at colonizing Mars (like gp suggested), they can be quite useful here.

- Turning Mars into a self-sufficient habitat is both an absurdly long-term (and laudable) goal and no guarantee of survival. We have to worry about the problems of surviving on Earth today and, in the very long run, how to live in many other places.

(upvoted your comment, because I agree with it)