It has been proven that the death penalty doesn't change the homicide rate. I think its bad, since minorities are way more likely to get a death sentence that white people for the SAME crime. It is another way to discriminate. Minorities are also more likely to be arrested, and sentenced for the same crimes compared to white people.
Most murders (90-95%) are not planned. Having harsher penalties doesn't stop murders. Access to guns, and social structure affects crime.
Plus the US executes kids as young as 14, which is against UN policy, to execute minors.
Also, there have been innocent people who have been executed...
It just isn't worth it to have the death penalty. We sink to the level of the killers then. I think rotting in a jail cell is a worse penalty, then death.