Didn't I warn you about using the Dragon Balls so much? Didn't I tell you that interfering with the natural evolution of things could have serious repercussions? Well? Didn't I?
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.
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)
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.