So you wouldn't be happy but you expect society (which is you x 300000000) to be happy? Or rather, how can society the structure be happy when the building block of that structure (the individual) is not?
Also, what of the people that do not want rehabilitation? Or who reoffend upon release?
So when you asked the hypothetical of my father murder you assumed my father had 300 million and 1 offsprings? I'm glad to say that to the best of my knowledge my father wasn't that prolific.
An individual of society can be unhappy about a decision, while said decision still providing a net benefit to the society, if one assumes that to not be the case, then we would also be unable to execute capital punishment, after all the family and friends of people that get executed are generally probably not happy about it either.
As for people not wanting rehabilitation, the question isn't if they want to or not, is if they can or cannot be rehabilitated, since rehabilitation when you are in jail isn't all that voluntary, if it helps think of rehabilitation as reprogramming.
Recidivism should be considered a failure of the rehabilitation of that specific person, and of the decision to release said person into society, either way recidivism rates are much much lower in countries with proper rehabilitation programs, to absolutely staggering degrees, Norway a country where this
https://i.guim.co.uk/img/static/sys...10.jpg?w=620&q=55&auto=format&usm=12&fit=max& is a prisoner in a prison has a recidivism rate of 20%, the US which treats its prison system as punishment has a recidivism rate of 76,6% (numbers from an article in 2014), not to mention the crazy disparity of people in jail to the population of the country.
Not that this matters much, since for rehabilitation isn't really for the cases of death penalty, since even if the US was to abolish the death penalty those people would just get life sentences, at which point rehabilitation in those individuals is of somewhat limited value to society.
If you are interested in learning more about how Norway does rehabilitation you might want to check this article
https://www.theguardian.com/society/2013/feb/25/norwegian-prison-inmates-treated-like-people
I just can't get on board with that. I'm all for rehabilitation for basically every other crime but murder. Nothing they could possibly do would make up for robbing someone of every possible future experience they would ever have.
You are assuming that all murder is the same, which it sure isn't, it is even given different statues under the law, and vastly different punishments that can go from a few years in prison to the death penalty.
Second rehabilitation isn't about undoing the past, plenty of crimes can't undo the damage that was done, it is about doing the best of a bad situation.