All this plans assume a human behaviour model that has been prooven to regularly fail on earth. Yes, there are spartan places on earth(monasteries, poor regions), but even they usually depend via "lifelines" on a continuous surplus on resources from some far away bristling nexus (city) or are permanently stuck in cycles of strife. A colony on mars, would break down with the first generations kids reaching maturity and realizing the remote prison their parents choose is for life.

In my mind, the whole colonize mars plan, is nothing but a elites escapism, who refuses to deal with the problems the species causes on earth and the necessary political change that entails. Its in that, very human, not very different from a neanderthal, who wants to escape his tribe, to find new mammoths beyond the horizon. But easy mammoth is extinct now and all there is to do, is to sit on electrically charged rocks and meditate for enlightenment.