While I respect the feelings of those who have suffered at the hands of a sexual predator, those emotions cannot be the only factor in deciding public policy. To do so would reduce the criminal justice system to revenge and blood lust levels. That may be tempting for the victims, but a disaster for the culture.
I agree with all of the above. What I find objectionable is finding a Constitutional bar to a state deciding the issue dispassionately and establishing criteria for when it may and may not apply the death penalty to a particular crime.