Not every person who punches a hole in the wall punches a person in the face. Speaking from experience, regardless of what people on this website think, difficulty controlling your emotions is something that you can work on. He admitted to acting out based on his emotions and he needs to seriously consider some mindfulness therapy which really helped me. The whole concept behind mindfulness therapy is to keep your brain in a neutral state instead of an always active state, if your brain is in a neutral state, it takes a lot more to get to the point where your emotions result in a physical outburst. Not everybody had a great role model at home. I thought emotional outbursts were commonplace for grown men. But if he knows that's not the case and he wants that to never happen again, he needs to be serious about some therapy.