Well, as a "comics devotee" I'll answer the "why Superman doesn't kill" thing:
Because taking the law into his own hands like that is not just a slippery slope to being a despot. It's a slippery slope to letting an alien with godlike powers actually play god with people's lives.
Remember, Clark isn't just some regular guy here. His powers, literally, make him a "god among men," just as Jor-El said. He looks like a human, but he's not. SV switched it up in having Jor-El choose Jonathan and Martha Kent to raise him, while in the comics it was just a coincidence that the Kents found him. But how they raised Clark helped instill a connection to humanity in him. It made him humble when someone who has the kind of powers he has could have let it go to his head.
And deciding who is worthy to live or die is just a step or two away from viewing himself as a god.
As to where the villains go. Many end up in Arkham Asylum (in Gotham) actually, if there just not sent to jail. Not many actually get sent to the Phantom Zone, mostly because humans actually can't survive there (something SV changed). ;-)
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Because taking the law into his own hands like that is not just a slippery slope to being a despot. It's a slippery slope to letting an alien with godlike powers actually play god with people's lives.
Remember, Clark isn't just some regular guy here. His powers, literally, make him a "god among men," just as Jor-El said. He looks like a human, but he's not. SV switched it up in having Jor-El choose Jonathan and Martha Kent to raise him, while in the comics it was just a coincidence that the Kents found him. But how they raised Clark helped instill a connection to humanity in him. It made him humble when someone who has the kind of powers he has could have let it go to his head.
And deciding who is worthy to live or die is just a step or two away from viewing himself as a god.
As to where the villains go. Many end up in Arkham Asylum (in Gotham) actually, if there just not sent to jail. Not many actually get sent to the Phantom Zone, mostly because humans actually can't survive there (something SV changed). ;-)