The safety of prisions plays in this way as I see it…
2267 Assuming that the guilty party’s identity and responsibility have been fully determined, the traditional teaching of the Church does not exclude recourse to the death penalty, if this is the only possible way of effectively defending human lives against the unjust aggressor.
**If, however, non-lethal means are sufficient to defend and protect people’s safety from the aggressor, authority will limit itself to such means, as these are more in keeping with the concrete conditions of the common good and are more in conformity to the dignity of the human person. **
Today, in fact, as a consequence of the possibilities which the state has for effectively preventing crime, by rendering one who has committed an offense incapable of doing harm - without definitely taking away from him the possibility of redeeming himself - the cases in which the execution of the offender is an absolute necessity “are very rare, if not practically non-existent.”
If the bolded section is not true, that is there are not “non-lethal means” that are “sufficient to defend and protect people’s safety” then the logic that uses those statements to construct the underlined portion is faulty and therefore voids that section.
Now I agree that this in no way means there should be more executions in the US. As I have said, while I support the States right to resort to capitial punishment, I am against the way that it has been implemented within the US.