Populating new places can enable a new start and experimentation with new forms of social organisation. Escape from the momentum of tradition.
But that's just speculation, right? It's actually not, because we've already seen demonstrations of this, like the founding of the United States and the democratic system they put in place there.
(I heard this viewpoint from reading Robert Zubrin's "The Case For Mars" https://www.amazon.com/Case-Mars-Plan-Settle-Planet/dp/14516...)