The problem with the death penalty is that innocent people are convicted of crimes. When we kill an innocent person we become murderers.

""Wrongful execution" is a miscarriage of justice occurring when an innocent person is put to death by capital punishment.[26] Many people have been heralded as innocent victims of the death penalty.[27][28][29] At least 39 executions have been carried out in the U.S. in face of compelling evidence of innocence or serious doubt about guilt.[30] Newly-available DNA evidence has allowed the exoneration of more than 15 death row inmates since 1992 in the U.S.,[31] but DNA evidence is only available in a fraction of capital cases. In the UK, reviews prompted by the Criminal Cases Review Commission have resulted in one pardon and three exonerations with compensation paid for people executed between 1950 and 1953, when the execution rate in England and Wales averaged 17 per year."

So if not for DNA evidence we would have executed 15 victims for sure that were innocent... Pretty clear that we have or will execute an innocent person.

Furthermore the death penalty does not reduce crime.

Now if they catch a guy who raped and murdered a child, there were witnesses who saw him do it there is concrete evidence he did it, shit kill him.

Bullshit with Penn and Teller did a very good show on the death penalty worth watching for anyone who is pro or anti death penalty.