Go ahead and start "fixing earth" then, you're free to do so if you think it is "sexy". Meanwhile others will work on launching rockets, a task they seem to be quite adept at. Also, drop the nonsensical references to a "colony run by a dictator" or at least explain what made you write that piece of prose.
Humankind needs a frontier to strive towards, this has always been the case and will probably remain so. There used to be many frontiers but technology has developed as such a rapid pace that they're starting to become quite rare. A fully reusable space launch system has the potential to open up space exploration to a far larger extent than the current - soon to be previous - generation of expendable launch vehicles did. This is a good thing since it gives people something positive to look forward to instead of all the negatives which are being pumped in their heads by the media, politicians and, yes, by individuals like you who deal in negatives like "wiped ourselves out on Earth", "a colony run by a dictator", "There is literally no. point. at. all".
As said, feel free to "fix the Earth" but may I suggest framing this in a more positive and inspiring way? If you hit the right tone - yes, tone is important - you might inspire others who might inspire even more people. You may be able to open a new frontier that way, just like people like Musk do by working on reusable launch systems. Negativity and sour grapes do not inspire others, people who want that can simply watch a political debate.