I’m not certain how a society should handle the phenomenon of the sadistic personality type. It all depends on the time and resources available. In war, such time and resources devoted to rehabilitation is severely limited. That the engineers of cultural sadism need to be got rid of ASAP cannot be argued against.
In traditional Japan, brutality and sadism were common and endorsed in the service of the Emperor and they remain an undercurrent in contemporary Japanese culture. Yet Japan is otherwise a remarkably orderly and polite society.