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 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 nonexistent."68
Sorry tiger, but according to the CCC the US just isn’t living up to their end then…
First of all, I direct your attention to the second paragraph. Let’s say you have a guy who kills kids. So he kills some kids, gets caught and goes to jail. Well, he isn’t going to be killing kids in jail. But let’s assume he’s just crazy enough to now try to divert his murderous rage towards anyone. Well, he can be locked in a box for the rest of his life and have his meals passed through a hole. There is a non-lethal means.
The last sentence, while not a blanket, is most definitely enough to keep a person warm at night. It leaves room for exceptions, but notes that they are few and far between.