As someone who advocates explaining why things are wrong rather than resorting to physical violence but also has a younger cousin, I sure have to hit him a lot for being knowingly an asshole. If they regret it or do something by accident, of course don't hit them, that's harsh. But sometimes explaining doesn't work because they're not interested in being on your good side or the consequences of their actions, and you don't have enough time to think of anything more fitting or lasting, so there you go, they get a punch. Call me irresponsible. Honestly, it's more out of frustration than an attempt to raise the child to be a good citizen.
As for the game data, fuck like half the people in this thread (jokes guys, but a little bit not a joke), game data is time and effort. Depends on the game of course, but you're not just eating or something where you get immediate pleasure for consuming a resource, especially in a game like GTA, you make decisions and express yourself and form a narrative that involves that exact character and your unique experiences. Sure you can make another one, and then you get the experience again, but it's not as good as the first run. So if you delete someone's game data it's like sabotaging a creation of art or music, only they put in considerably less effort and it has less significance (that is not, however, equal to negligible significance).
And for clarification, the punch I would give and the punch I assume the OP gave are the punch you give to a 13-year-old, not the punch you give with the intention of harm, because that shit would cripple them. If your punch is worse than the hardest hit you would expect a 13-year-old to give, you're possibly operating at the wrong scale for the situation and should tone it down.