I respect John Paul 2 for having lived through the experience of an attempted assination; and I respect him for for giving his assassin. I also respect him for being a brilliant philosopher and theologian.
However, whether it was specifically by his hand, or others under his direction who coined the bit about “unless society cannot be protected” and the drivel about how modern society can separate the criminal and protect the rest of us, it was written by someone who has little or no clue about the real world out there - the one that polite society has almost no knowledge of, and wants no knowledge of .
Whereof I speak? Do a little research on the beloved Mulsim cleric who was convicted in the first bombing of the World Towers, and what they caught on to finally that he was doing while in what should have been one of the finer, if not finest prisons around.
They can be shut off from society? Society can be protected from them?
How much physical violence, how much sexual violence, how many deaths are caused by inmate on inmate contacts in prison - and why are not other prisoners to be protected?
There are repeated studies showing that the death penalty is lacking in justice in terms of who dies, and who doesn’t. There are futher studies repeatedly questioning whether the death penalty has any significant deterrent impact on criminals. And the costs of actually putting someone to death far, far outweighs the cost of warehousing them for the rest of their natural life. Add to this the number of people wrongly convicted - I am not talking about the “not guilty”, but rather of those who simply were not the perpetrator - and executed, and one can see the system is far, far from perfect.
But if the justification for extremely limiting the death penalty is because of the alleged ability of society to protect everyone else from the killer or serial rapist; then the justification is built on a house of sand. In short, 'tain’t true.
And as far as throwing them in a cell, throwing away the key and not cutting them out of the cell until dead, well, guess again. The ACLU will have those cases in front of a judge faster than you can scratch your name illegibly on a sheet of paper. Protection? Nope.