(He's hurting, physically and mentally. He hated that you were under babidis control. He knew you weren't a full on good person, but damn it you were making progress. To think it could've been all for nothing because that tiny ugly lizard exploited you sickens him to no end. Your evil ways were brought back to its prime, maybe even more so. That magician had brought it back, and that hurt Goku. He needed to fight you now, he had to prevent you from hurting others. But more importantly, he needed to stop you from hurting yourself. He didn't want to see all your progress go down the drain. Maybe, just maybe, he can snap you out of this and bring back the person he used to know.)