Do you really think a child is ever going to tell any (responsible) parent that they just beat up another kid for fun today and ask for a high five?
I don't think I've ever encountered, in real life or media, a child coming clean with their parents about harassing and hurting other people without some outside pressure (aka other parents or the school getting involved)
No I don't think that they are going to ask for a high five. That's a meaningless straw man.
I think that kids do experience shame when they hurt others, and will confide in people they trust, if they have such a person.
I have witnessed this. Obviously if they've developed a serious pattern of bullying then it's going to be a lot harder, but having kids have someone they can confide mistakes in before that happens is part of how we can prevent it from developing.
I don't think I've ever encountered, in real life or media, a child coming clean with their parents about harassing and hurting other people without some outside pressure (aka other parents or the school getting involved)