I am glad you included "IMHO" in your quote. That relegates your response to the subjective realm of personal opinion, not objective fact. Nor can you point to anything 'irrational or haphazard' in the way the death penalty is carried out. Again that is your own person bias not something based upon reality.The death penalty is something from the dark ages, not from 2015 IMHO. And no, it is not objective or impersonal because of the subjective, irrational and haphazard manner in which people get the death penalty.
Yet these same criminals you pretend are haunted by their acts do whatever they can to prolong their own lives and avoid the death penalty. Your error here is to put your own feelings into the minds of cold blooded killers. You ASSUME they feel remorse because you would.And it is worse because the criminal will be confronted with the results of his actions and he will have to think about what he did for the rest of his life (long life). At least that is my opinion.
Nothing you wrote here counters