THe thing is, our mistreatment of this planet is the result of millenia of misunderstanding how it works...
Because we're so set in our ways and nationalised, we can't uniformly control people's actions towards nature, but if we had colonists, they'd be:
*criminal record free - who's gonna send a criminal on a high importance colonisation program,
*A "good citizen", i.e., someone who has been picked by the corporation to be trusted,
*the government would have to be unified in order to colonise the planet anyway, so national differences would be irrelevant,
*Corporations would likely keep up the fines set by environmental bodies,
Only thing I gotta ask, when we've colonised say, ten planets, will we have to learn the specifics of every continent, country, name and capital of each? I dunno about you, but for me Geography class was hard/boring enough.