Elder Kai, Bulma and others in “Unfinished Business”

That's why the Dragon Balls are scattered after every wish. It's supposed to take centuries to find them so the negative energy can't have time to accumulate. But then someone invented the Dragon Radar and ruined everything.

Oh, so it's all my fault, is that it? Well, why don't you just say it!

There were those that were aware of the dangers of overuse but no decision was ever made to warn the people of the Earth.

Well, how in the world was I supposed to know? It's Dende's fault if we were never warned. So you see, it's not all my fault. We're all a little to blame, actually. Well, aren't we? Ha! I know! Even though I invented the radar, I still wouldn't have been able to find the Dragon Balls. I was just a little girl of sixteen, trying to find her prince with the Dragon Balls. But that was just a school girl's dream. A silly fantasy. But then this big shot came along! (pointing at Goku)

Who me!? You mean it's my fault!?

Well, yeah! I was just a knobby-kneed adolescent back then. I could've never gathered the Dragon Balls on my own. You were the one with the super strength. You're responsible for gathering the Dragon Balls.

I guess I am. I see what you mean Bulma. I am responsible. I never really thought of it that way until now.