@Erimitus Said
foosyerdoos Social laws work around these natural constraints.
Erimitus: I do not understand what you mean by natural constrains. Please explain.
I(and most people) try and get through the day without being aggressive. I(and most people) also try not to inflame aggression in others. That's not to say that during the course of my life I will not encounter people that i would very much like to punch. I naturally choose to constrain myself from doing so, because as you say, there would be consequenses for any such actions.
The problems start, i suppose, when you feel you have been given permission or justification to act with impunity against another.
This permission or justification could come from yourself,if you feel you have been wronged. From your peers,when they/you feel they have been wronged. Or from Governments, when they feel wronged.
The law is merely there to decide if there was justification or not.
So in that respect, I suppose legal social constraints are needed.