How could they: people resort to violence because their moral codes demand it
Even though the popular rhetoric about violence is that the perpetrator is ruthless or has lost control, most violence remains unfathomable. Tage Rai writing in Aeon Magazine presents a theory in the understanding of violence. It is not driven by the absence of morality or the momentary lapse in moral reasonining, but in fact, because people’s moral codes demand it, he writes.
From Aeon magazine