>>149372349 (OP)when they made Superman 1978 the US space program was still running, not some privately-provided joke being undermined by private interests who want private space travel to be a reality (in spite of their inability to provide it in any realistic scale)
when they were making this movie it was clearly obvious to anybody with eyes that the only people who'll be going to other planets are slavers, because that's literally the manifesto of the would-be martian colonists who are hollowing out public-owned space exploration and replacing it with junk halos and exploding dickships, to go to mars etc with a million poor people and have them work off their travel debt (protip: they never would even if they weren't facing incredibly hostile conditions, they'd be there as breeding stock for the next generation of colonists and free labor for the colony owners); whether it ends up being chattel slavery, bonded servitude or simple truck, it's clear that the only people who'll be making decisions on mars will be the owners of the colony, and nobody will be coming to help the colonists themselves (though apparently we might just nuke them quietly)
of course if we were going to an inhabited human-like planet, there wouldn't be much point sending many colonists (expensive) when you can just send a guy or two to breed with the population (if you've seen Man of Steel, Invincible etc and don't know how genes actually work) or lord it over them and make them change the world to your liking
and that's why there will never be benevolent Kryptonians again, because nobody now believes in the dream of peaceful space exploration, because the reality is, it's for-profit and fuck-you