Re: Don't forget the fate of early Earth colonists
Mars has an abundance of what is the single most pressured resource on Earth: land.
Colonies are all about having a new place for people to live. Emphasis on "place". Earth is starting to feel pretty crowded, and if young people today are going to carve out their own patch - it's far from clear where they can do it. Old people, who are living longer than ever, tend to be reluctant to give away their remaining land. That sort of reflection, over time, leads to pressure and conflict.
Resolving that pressure was what colonialism was all about. The USA had "the Frontier" for the first part of its existence, but when that reached its limit - within a generation, they had civil war.
This is why "intellectual property" is so trendy - it's a way to let people feel they own something, without having to take it away from a current owner.