This has been bothering me ever since the first time someone mentioned it in a thread about plot holes.
Why?
Is it because the people like challenges a la Goku? If so, doesn't that mean everyone in the universe is just a supreme d1ckhead?
And if nobody has thought of it, doesn't it mean everyone's just stupid?
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I think it's something about power and greed, and how people would rather be immortal or whatnot. Or, it's in the heat of the moment, and they can only think to banish the one bad guy who's around.