For Freud, morality and prosocial behavior are born solely from a feeling of guilt and from defense mechanisms used by the ego to handle the restrictions that society imposes on the innate aggressive impulses of the individual, as well as the irrational demands of the superego.
I disagree with this but to think that humans wpuld be peaceful etc. if it wasn't for nasty culture or society is naive and ignores our (pre-)history.
