I don’t support death as punishment, but sometimes the only tool someone has to protect others is murder. Right now the system gives people no option to defend themselves from law enforcement officers other than through civil war, so it is just that law enforcement officers are murdered in (community) self-defense.

If there is a succesful revolution, old regime law enforcement prisoners of war are no longer in a position of power supported by the state. Killing them would no longer be clear-cut harm reduction when house arrest and rehabilitation are on the table. At that point, why kill him?

If he’s alive you can put him on house arrest and give him some craft tools and let him make stuff that others can use. It wouldn’t be forced labor; as every “give people free money and see what they do” experiment has shown, people will just make stuff if you let them.