Wait, isn't this actually a crime, a robbery? The hat was very clearly being given to the child, not to the asshat.
When he took it, it belonged either to Kamil Majchrzak, the tennis player giving the hat to the boy, or to the boy, Brock, it was being given to. I'd say a police investigation and a punishment of some kind would definitely make sense here. If you steal from a child like that, you should get registered as having made a crime.