Behaviour is regulated by feedback. It is the anticipated and experienced consequences of an action which influence the likelihood of that action’s occurrence and recurrence. A man acts the way he acts because he perceives those actions to have served him in the past.
It is therefore imperative for the cohesive functioning of any group that each individual is confronted with the consequences of his actions, whether they be positive or negative; for just as a child may be conditioned with reprimand to inhibit his aggression he may just as effectively be conditioned in the opposite direction by acts of appeasement. It is by this mechanism that the group tempers the individual.
Without consequence, human nature manifests with impunity.