The big problem is...how does making it a life sentence help. A life sentence is just an inefficient death penalty.
That said, I think they are throwing it around a bit too much. It's supposed to be there for true sociopaths and animals.
As to the morality behind it, it's simple. Basic Locke. If one chooses to break the Law of Nature and kill another person for no justifiable reason, then they have chosen to abandon the idea of a peaceful society. They are nothing more than an animal in that sense. They have to be removed from society or killed.
That said, I think they are throwing it around a bit too much. It's supposed to be there for true sociopaths and animals.
As to the morality behind it, it's simple. Basic Locke. If one chooses to break the Law of Nature and kill another person for no justifiable reason, then they have chosen to abandon the idea of a peaceful society. They are nothing more than an animal in that sense. They have to be removed from society or killed.