Every State has the right to employ the death penalty but just because they have the right to use it doesn’t mean that however they use it is right. Hitler, Stalin, Pol Pot, and Mao all, by the simple fact that they were rulers of nations, had the right to employ capital punishment. That all of them grossly abused that right doesn’t mean they didn’t have it.
Christ recognized Pilate’s right to execute him but I’m pretty sure he didn’t consider it a just use of that power, but if Pilate had that right (“You would have no power over me if it were not given to you from above.” Jn 19:11) then surely Hitler did too.
Whether the death penalty should be applied to crimes other than murder is not all that relevant a question. If it doesn’t apply to murder then it doesn’t apply at all - let’s debate whether it should apply to murder.
Ender