mainly it is in case any portion is overturned. even if they get 50 years knocked off, and good time, they got multiple lifetimes to go. if having under a certain amount qualifies for some less secure prison, not happening. then its to give some sort of justice the victim families. in reality the courts cannot punish someone that kills multiple people fairly. but they can give a life sentence for each person. just calling it life robs them of ownership of a block of that time.
United States