The leverage with which powerful people can control others on Mars would be undeniably much greater than on Earth. On Earth, you can flee on foot. You can hide in the amazon and become a hunter-gathered if you want. On Mars, if you're at odds with your colony leadership, you have to acquire spacesuits air food water building materials etc. Everyone will know where you are on a Mars base, and all they have to do to eliminate dissent is "accidentally" depressurize the compartment. Mars requires living together and depending on each other a great deal, and that lends itself to strong rules and strong leadership.