Heaven, increases all feelings to their extreme quality. Hell, decreases all feelings to their minimum quality. So if someone dies feeling sorrow, rage, hate and goes to heaven they’re going to feel all those to their extreme, that is why god creating hell is actually an act of love because he wants us to feel sorrow, hate, rage as little as possible and feel love to its extreme.
The idea of punishment is to prevent further misbehaviours, not to throw shit back at the kids. The goal is to teach the proper behaviour.
But hell is supposed to be eternal, and as such there is no evolving from it, making it not a punishment but a torture.
Now if you believe in torturing kids who misbehave just for the sake of making them suffer, that’s something else.
The threat of punishments stop people from doing things. God told Adam and Eve that if they ate that fruit, they will surely die. They did it anyway. Hell exists to discourage us from sinning, yet allowing us free will, still. But we still chose to sin. So we’re damned.