I think most children are inherently good-hearted. We all start out as children.
Then, over time and accumulated hurts, and through training of what matters and doesn't matter in this world, they lose their inherent goodness and branch off into all kinds of moral pathologies.
If a child doesn't have enough to eat, they will steal. They didn't start out believing in theft. But the CRUELTIES of life taught them the only way to survive is by theft and even by killing whoever competes for their food.
Luke 18:15-17. In my opinion, this is one ONE reason, one of many, that Jesus said this about children:
āLet the little children come to me, and do not hinder them, for the kingdom of God belongs to such as these. Truly I tell you, anyone who will not receive the kingdom of God like a little child will never enter it.ā
I'm not going to get into Bible Arguments about that meaning - God knows many preachers will do that today so they can have their blah-blah-blah arguments. Blah-blah-blah, go to church today if you want to hear their blah-blah-blah arguments. But, that's what the verse says. Plain as day.
Anyway, I think we start out pretty darn good. We just want food, warmth, love, some fun, and to be kept SAFE. Then enter life and work and the cruelty of the adults and children learn that life is about competition even for basic needs, like food and housing. Then they change.