IMHO, you’ve got it exactly right. As I study the Holy Saints I read about those who converted even the most apostate through the power of prayer, though it took a lifetime to do, and those former apostates became pinnacles of the Holy Church! So, again IMHO, life without the possibility of parole is the way to go for the most vile of aggressors. Their “second chance” is to contemplate their sins and whether God belongs in their lives until natural death takes them.
The problem is that America is not, and never will be, a majority-Catholic country. And that means that we will probably always be outvoted by others who seem to feel that the only choices are the death penalty, or giving a violent aggressor his “second chance” out of prison and back in public. NIMBY (not in my back yard), I hope.