The UK used to have the death penalty but abolished it many years ago, except maybe for one or two crimes (maybe treason, not sure). I hope it never comes back. If murder is wrong, then state murder is just as wrong. There have been so many wrong prosecutions in all countries of the world - if someone has been hanged for a murder they did not commit, it's a bit difficult to bring them back. At least they can be let out of prison.