But then it's not punishment for punishment's sake, but for deterrence's sake. I read the comment as talking about retribution, to make the victim feel good, n

But then it's not punishment for punishment's sake, but for deterrence's sake. I read the comment as talking about retribution, to make the victim feel good, not about deterrence. Are you saying you have data to show that 20 years for murder has a different deterrent effect than 120 years for murder?