To them, its NOTHING... You forgot they got NOTHING to lose. They are there for LIFE.
Say, you are 35 years old, and you got life sentence plus say 100 years, okay so you escape, that would cause your years increase to 120 years, would that make any difference to you? The chances are, you will laugh.
When one has life sentence, they have nothing more to lose really. Adding more years is pretty much like a joke.
