Colonizing Mars could very well be humanity's second chance of rebuilding a proper and organised society, one which relies on cooperation rather than competition. The way I see it, we could go two ways:

1. Earth 2.0 - As the name suggests, we would just implement our same laws on Earth, again on Mars and practice the same government and the rules. All that would change are the resources.

2. A Potentially Better World - Even though Mars may not have the same amount of resources, it could be a very good excuse to start life all over again. To plan things out beforehand, and still keep room for improvising. To give away the power to the people and not just the authorities to keep balance in decision making for the future of mankind.