He doesn't have to become a villain to become a pest to society. Bakugo is so volatile, he's like a kid with an AK47. Remember his outburst just from Shoto not using his other hand? Teachers had to chain him down. What if there was no one strong enough nearby to stop him? How many civilians can he hurt or kill by accident because of his temper tantrums? Remember how he went nuts during the cavalry battle and ignored his teammates? How can he even work together with other heroes with how he behaves?

He needs to learn patience and humility. That's all part of becoming an adult.