The actual words were: “Thou shall not commit murder”
Not: “Thou shall not kill”.
Which is why the ancient Jews, from whom we got the ten commandments, were not squeamish about capital punishment for capital crimes.
The “accepted” interpretation is a modern invention.
Some of us not-so-ancient Jews aren't squeamish about it, either.
You've got to be extraordinarily careful that the person actually did the crime, but once that's established its hangin' time (or shooting, or the chair, or injection, etc.). Scum like this don't deserve to live, and we in the rest of society don't deserve to have them still around, costing us money better used to help the unfortunate and with the risk of further violence as the result of an escape and/or parole.