text: "That assumption is: 'Given the possibilities which the State now has for effectively preventing crime by rendering one who has committed an offense incapable of doing harm.' What evidence does the Church have/show for making that statement? None! That is why they have never presented any."
  
  The statement from the catechism means that since the state has the ability to contain convicted criminals, it need not execute them in order to protect society. No evidence is required for that. It is simple logic.
  
  The fact that inmates harm one another inside prisons -- and such injuries are not limited to those convicted of capital crimes, by the way -- is an indictment of the penal system but not an indictment of Catholic teaching. Your time might be better spent working toward true prison reform than using the sorry state of prisons as an argument in favor of legally sanctioned homicide.