Not really relevant.
A lot of people die every day. Doesn't mean that this issue is unimportant.
I support the death penalty, but you want the death penalty system to be as error-free as possible. The advent of DNA testing has helped decrease the likelihood that mistakes will be made.
On the other side of the death-penalty issue, we have "repeat offenders" in the headlines almost every day as they locate the bodies of the kids they killed.