This points out that our use of the death sentence is far too limited. We should consider making it a capital crime if the victim suffered irreparable injury (physical, emotional or financial) that would significantly diminish the quality of whatever life they have remaining.
For instance, the rape of a child. Or bilking blue-hairded little old ladies out of their life savings.
Because the whole rationale of a capital offense is you have broken one of the most sacrosanct of civilization’s proscriptions. And the only way to be certain you cannot repeat the offense is to put you in a hole in the ground.
Because the rate of recidivism among criminals who have had capital punishment correctly administered is 0.0000000000%.
I agree that capital punishment should be more widely applied, but only if there is not a shadow of doubt that the accused committed the crime.
However... if someone has committed a crime and knows that the death penalty will apply to him, he may well murder any potential witnesses to prevent testimony against him.