Being born into that kind of gravity would probably be best. Imagine how difficult it would be for one of those people to visit Earth, though. Even astronauts who are in space for short periods of time lose a lot of strength due to no or low gravity environments.
We definitely need to eventually terraform and colonize Mars, though. The sooner the better. My reason is that humanity needs to have a backup plan. All it would take is one space rock of the right size to wipe out everything on Earth in an instant. I believe our species having the ability to survive that sort of calamity is an extremely important thing.
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