If a person is innately kind, then what influences his personality is the environment he lives in after birth.
After all, everyone is inherently good, but if placed in a bandit's den from birth.
Growing up exposed to daily killing, torture, and all sorts of evil, he will develop a personality akin to those bandits, doing all kinds of evil.
This is the concept of "being influenced by one's surroundings".
Even if a child is naturally mischievous and does some wicked things, if surrounded by kind people, this mischievous child will eventually be taught to become a good person. For children, distinguishing between good and evil is difficult; what they find amusing might seem evil to adults.
This is when more benevolent guidance is needed; otherwise, the child will stray further down the wrong path.
For instance, a child might catch a bird and play with it until it dies.
