You obviously didn't read everyone's posts in this thread before making your own post or you would see us asserting that they are a threat to others after receiving a life sentence.
This will be news to you so pay attention. The "lifers" run their races respective prison gangs in our federal, state, and local prison/jail systems. These murderers issue "hits" all the time on both inmates and citizens in society.
It's called being "in the hat" in jailhouse lingo. "Soft candy" are people added to the hit list to be murdered if the opportunity arises while "hard candy" hits are to be aggressively pursued.
Our entire system of reform in the U.S. is held in the grip of the prison gangs which control the street gangs which control the criminal associates and wannabe elements in society.
If you go to prison and you don't fall in line with the rule of your "car" (e.g. the prison gang that controls the race at the institution you are incarcerated), you will be victimized repeatedly or murdered if you don't "roll up" into protective custody (e.g. PC) to serve out the remainder of your sentence in a small cell where you get only one hour a day out of it.
We have lost control of the reform part of our penal institutions to murdering "cant' stop won't stop" "blood in blood out" (you murder to get in and you die to get out) prison gangs because people like you gave these unrepentant murderers life sentences instead of the death penalty.
Some murderers do repent and become Christians but most never do and that's why we have real reform almost shut down in our penal institutions today.
I see no reason for the death penalty. If you take a man who has committed murder, and sentence him to life in prison - he's no longer a threat to anyone, and should simply be left alone. Once of the girls that were part of the Manson Murders seems to have embraced Christianity. Would I let her out? No, she's serving time for what she did here on earth, but God can decide if she's sincere, and welcome her into heaven. Jesus was being crucified, and pleaded that they receive forgiveness for their sins. The first real sermon was in the book of Acts, where some of the people that helped crucify Jesus were forgiven. The Apostle Paul arranged to have many Christians murdered before he was converted. He who lives by the sword dies by the sword.