Leaving the planet is meaningless if you still must rely on Earth for support. The moon is not going to be self-sustaining in any feasible future we might live

Leaving the planet is meaningless if you still must rely on Earth for support. The moon is not going to be self-sustaining in any feasible future we might live to see. We’re stuck on Earth for now, let’s try to deal with it. Besides, if we can’t survive the fertile planet of our species’ birth what kind of lunatic arrogance makes us think we’ll survive a lifeless, airless rock?