The same can be said of the other side.
There is no way that 2267 can be read as a definitive exclusion of the use of the death penalty.
It states, “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.”
Now while it does also say, "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. "
And that today it is the belief of the author of the Catechism that such is almost always the case one can argue against that.
We must remember that others who are in prision have a right to be protected and there are numerous cases where one person in prision preys upon others in prision as well as the staff there. There are numerous cases were a person convicted of a violent crime (murder) commits the same crime against those who are jailed with them or against staff members.
So one could successfully argue that there are not “non-lethal means are sufficient to defend and protect people’s safety from the aggressor” according to our legal system as locking someone up with 100% no contact with anyone is not possible.
***Having said that the Catechism is not just a list of doctrines that must be adhered to, it is more than and less than that.
This is something that we are free to have different opinions on. The non-negotiable are the dogmas of the Church***.