Just because a certain behaviour doesn't show up in a certain stage of life, doesn't mean it isn't an inherent behaviour. Babies don't talk. Talking is still an

Just because a certain behaviour doesn't show up in a certain stage of life, doesn't mean it isn't an inherent behaviour. Babies don't talk. Talking is still an inherent behaviour of humans. Young children's social environment is almost entirely defined by their parents. You'd expect very little aggressive behaviour there.