Who's blithering? A dead anyone will NEVER AGAIN offend anyone. Why not kill everyone, that way nobody offends anybody.
You've changed the issue. The issue and my argument is not "never again offend against anyone", but keeping society safe by the incarceration of dangerous criminals.
Incarcerated dangerous criminals can escape or be released.
Dead criminals cannot.
No, I did not change the issue. The issue is protecting society (since you have, falsely, ruled out punishment). So ... protecting society against what? Obviously, repetition of whatever crime the person committed. Again, there is NO better way to protect society againt repeat offenses by a convicted criminal than to kill said criminal. If protecting society is the goal then we should be killing more criminals, not fewer.