If a society is to maintain stability, it must have the right to meet out punishment. There are certain crimes that merit the death penalty. However, it is not the state that decides guilt. It is a jury that makes this decision. So, in effect, it is not the state that kills people. They simply carry out the will of the people who have decided the persons guilt.
The death penalty is needed to get rid of immoral people, who's mind is as callous as the carbon on a white dwarf and can't be rehabilitated.
To answer this question, let me say that it is worded in a way that it is hard to say. If we are discussing about the Death Penalty, if the criminal charged with the Death Penalty does not get it; the state should only have the right if the criminal killed a huge amount of innocent citizens. Otherwise, let the people decide within the jury. But worded the question, of just allowing the state to kill off anyone, I would have to disagree. That is definitely inhumane and not just!
The government would be stupid to kill taxpayers.
Doesn't this begin moving towards possible tyranny?