talk about prison and punishment system

if we dont want retribution, no hate, what do we do to killers? let them live freely and kill freely? there's gotta be some cruel but not so unusual punishment, such as death penalty we can use. also we dont want prisoners to work, but want them to live well and eat well? what about those innocent poor people outside of the prison who didnt do anything wrong just sh*t out of luck? fairness is just a word we define, how we interrupt it still depends on ourselves. there's on absolute fairness exists any way. death penalty doesnt stop crime, let them kill free probably encourages it. there are some mad people who are never afraid of death penalty, but this retribution + cruel but not so unusual punish will certain deter some 'sane' people from committing such hideous crimes.