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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Yeah maybe someone one day DID wish for the earth to be eternally protected from evil. And the Z fighters just happened to turn up, become somewhat friends and save the world on numerous occasions. Wish granted, if you ask me.