We should not be bringing them back, make it a one way trip to set up the colony, sure, there will be casualties but plenty of people want to volunteer.
Dont have to be astronaunts, thats old thinking, these are pioneers setting up new human outposts.
Send 100, with resupply, they are expendable, we can send more next trip.
That’s basically how the new lands of North/South America and Australia were “settled”.
Those who came to the “New World” never returned to whence they came.