Populating new places can enable a new start and experimentation with new forms of social organisation. Escape from the momentum of tradition.
This isn't just speculation. We've already seen demonstrations of this, like the founding of the United States and the democratic system they put in place there.
This sort of thing could help us address the sort of problems you mention. Like with the case of the US, successful new ideas can be transplanted back to other places.
Also the fact that in the long term colonization may help with overpopulation on Earth.
(I heard this viewpoint from reading Robert Zubrin's "The Case For Mars" https://www.amazon.com/Case-Mars-Plan-Settle-Planet/dp/14516...)
What options do we have? I mean, have anyone really thought up an alternative social/economic system that could work, given the human nature?
In terms of social organisation, the thing is that we don't really know for sure. You have to do experiments and see how things work. You can't say, before the fact, that it definitely will or won't work. Being able to experiment is really important for progress, but it's really hard to do within established systems.
Do you have a source for some of these?
> Being able to experiment is really important for progress, but it's really hard to do within established systems.
Sure, that would be a nice side effect, but not part of something that justify something like this...
An example of what I'm talking about is tariffs.
the population growth rate in developed countries tends to 0 as sanitary conditions and child survival rates increase, it's even negative in some countries, actually. Do you really think it would be easier to develop industrial nations in a barren wasteland than on earth?
Did I say anything about that?