[jjoonathan]

People on Earth will care about Earth, people on Mars will care about Mars.

Do you give up on US problems just because you have lost relatives in Europe? No. Do your lost relatives in Europe give up on European problems because a lost relative moved to the US? No. Neither of us has ever met them, but I can still confidently say "no" because that's just not how people work. We have plenty of things to worry about, a mars colony altering basic psychology shouldn't be one of them.