"Most people are good. You're born good"

I don't believe so. Do you have kids?

kids care first and foremost about themselves, like adults do, but worse.

I had seen 10 years old killing a dog with wooden spears just for fun(or curiosity or whatever crazy reason), cutting the tail of reptiles or just smashing them with stones. Or beating , insulting, humiliating other kids for the same reasons.

Not that far from Romans wondering how much time it will take for a Lion to kill a slave.