I think you are just imagining a worst case scenario. Why is any point of this true: No chance to ever feel fresh air on your face, no chance to go swimming,

I think you are just imagining a worst case scenario. Why is any point of this true: No chance to ever feel fresh air on your face, no chance to go swimming, never meeting a stranger until they're suddenly your neighbors for life, no chance to ever get away and start anew, and no chance to go back to Earth. The fresh air one maybe, but there's no particular reason the chemical and physical make-up of Earth air can't be recreated. Swimming can happen in a swimming pool and fake/indoor beaches exist. You can move with people you already know; anyway, isn't "never meeting a stranger until you're living next to them" the standard procedure for moving house on Earth? There's no reason that one can't move around, even back to Earth. They did get to Mars/other planet in the first place.