By killing the criminal punishment is considered to be the most decisive way that criminals who are not able to do so again in order to reduce the population of criminals in society because he was unable to come back to do it again.
Punishing criminals by killing considered as decisive as well. This will ensure that criminals can not do it again in order to reduce the population of criminals in society because of his ability to do those things again.
To punish the criminals by killing a decisive way greatly. Which gives the criminal person can't do that again to reduce the population of criminals in society, because he can't come back to do them again.