That is a great ?.
It seems that the world contains both Good and Evil, and babies suck up the world like a big sponge. It is how they process the stuff in their sponge that may be the answer to your question.
History has shown that Evil is the default characteristic demonstrated by humans. No one has to educate them on being evil. while there is always someone telling them how to be good.
People may be good in their heart, but how their minds have developed in their environments, and their experience can override the best hearts. Temptation to do evil is far greater IMHO, than it is to do good.
I always like the phrase, "NO Good Deed goes Unpunished".
While Bad Deeds go unpunished most of the time, basically because we don't hear or see the bulk of them.