What Are You Talking About?
No Mars supporter here I know of claims making things on Mars is easier than Earth. It's easier to support a colony on Mars than any where else BESIDES Earth. It is precisely because Mars is the most like Earth in terms of usefulness to humans that it is the best candidate.
The issue I'm trying to address is why Mars is the most important near term goal over other potential space destinations for humans. Not sure what point you're trying to make with all your topic shifts.
Reagrds,
Mark