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I'm guessing you only know of the Tim Burton series?
Batman's no-kill policy stems from the comics which Nolan stayed faithful to and it's because his parents were shot.
Or a simplier reason would be the same as any other superhero. If they were to kill the guy then they'd be guilty of first-degree murder. It's why Wonder Woman was wanted because she snapped a guy's neck or Spider-man for seemingly killing a guy. And why Batman was on the run because he took the blame for Harvey's murder and such.
For Kio....I'm pretty sure most people are annoyed with the fact he's crying and whining about understanding each other while fighting when that's not the reason behind the fighting to begin with.
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