We all agree that killing a person on purpose is a murder and the killer should be killed, since he gave himself the right to take the life of a person for any reason then the capital punishment will be the right of taking his life. But with most of the crimes the death penalty should not be used, and I say most of the crimes because some crimes are considered like murder so the death penalty should be applied.
A crime is giving the right to take or in other words affect a part of the life of a person or a group of people, for example, robbery, hitting a wife or anybody badly, drugs, etc.…
