What if each person on the planet bore the pain that he or she inflicted on others? Would that be a deterrent to the physical, mental, and emotional anguish people suffer at the hands of others? Thus if person A slapped person B, then person A would feel the sting. If person A stabbed person B with a knife, the blade would pierce person A's body. If person A hacked into person B's computer with the intent to steal, person B's possessions would remain intact while person A would lose everything.
And if the rich and powerful try to be clever and hire mercenaries to carry out their plans, the intent would serve just as well as the action and they would suffer the consequences. Under those conditions, how much death and destruction would someone be willing to commit? Would that serve cosmic justice?