Mars Won't Be Earth Mk II

The Dinosaurs ruled the Earth for tens of millions of years and as far as i am aware they never damaged it much so us humans who have been in charge for only a tiny fraction of that time and we have made a complete pigs ear of things so until another comet comes along to wipe us all out and allow the dolphins to take over, the poor old Earth is stuck with us polluting it.
As the climate warms and things get worse we need to look for an escape route and all our eggs seem to be going into the basket marked 'Mars'.
SpaceX CEO Elon Musk is leading the charge and wants to get humans to Mars as soon as possible and is planning on massive, heavy-lift rockets to carry colonists in fleets of ships to the Red Planet.
A quick glance around the solar system shows us just how limited our options are so Mars is the best of a bad lot but our technology just isn't up to scratch just yet so we are bound to this little ball of rock with our polluted sky, sea and ground until we not only find a way to get to Mars but work out how to terraform it for our needs.
The problem is Mars really isn't anything like Earth with one third of our planet's gravity but also has unbreathable air and very little water which is a bit of a drawback to us breathing and water drinking humans.  
Enter terraforming or changing a planet’s climate, topography, or ecology to be more suitable for life but NASA’s say it is not possible to terraform Mars using present-day technology so whether we can terraform Mars or not, it does look like we’ll be visiting relatively soon if Musk gets his way and we will have permanent bases on Mars and after the initial euphoria we will face a massive problem of who is in charge and who gets to make the decisions?
A team of scientists, philosophers and lawyers have set out a template constitution for the inhabitant of the Moon and Mars which sets out principles like a 'right to oxygen' and the 'right to leave' but at some point after the human race has spread and become a permanent fixture the question would have be asked, who does the Moon or Mars dwellers answer to?
History shows that colonies tend to start resenting their owners pretty quickly (think US and UK) and revolutions happen and humans being humans there is every reason to suspect that the inhabitants of the Moon and Mars would revolt at some point.
The Blue Marble Space Institute of Science has suggested that Mars should be independent from day one and colonists would cease to be 'Earthlings' the moment they land on Mars or the Moon and would be left to their own devices until their society has built up to the point that they can establish a trading relationship with Earth.
Seems a bit harsh to just leave them alone and it is hard to believe that we could, we have never just left anyone alone and the countries that spent billions getting them up there in the first place wouldn't want to.
It is a problem for the future but something that should be considered because if us on Earth interfere then we could cause resentment and foster chilly relations with our newest neighbours.
We haven't even mentioned the political and economic model that would be followed, would the supply of oxygen be run under a Capitalist system where it could be denied if payment is not forthcoming or a Socialist system where it is subsidised and the Government provides it to everyone?
Would there be an unelected monarchy, a President making the decisions, a Government where the decisions are made by cabinet, a Corporatocracy with the missions financial backers choosing when and what is required or even a Technocracy with experts making the big decisions?   
Starting up a whole new World sounds great until you think about it and it is a minefield.