Assuming we are talking about a self sustaining colony on Mars, what about the right to self-determination? Do people really still accept that you can rule over

Assuming we are talking about a self sustaining colony on Mars, what about the right to self-determination? Do people really still accept that you can rule over a colony far far away? Plus, why bother? There is nothing on Mars that earth needs. As long as I can visit on vacation, why would I care what Government it has?