Should the death penalty be stopped?

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I often wonder whether the death penalty will ever be implemented in all states of the U.S. There is always the argument that an eye for an eye is not the way to deal with criminals who have commited murder, and there is always the opinion that if people take the lives of others, they must be mentally ill and do not need to be punished for it. Unfortunately, some people are physically different, and do suffer from mental disorders that render them unable to feel remorse. Obviously something is not right for people to murder others, but oftentimes there is substance abuse involved which causes temporary instability. Where do we draw the line? Do we impose the death penalty anyway? Or do we house and feed these defective souls at the expense of the taxpayer, and leave the victims families to suffer?.