death does stop re-offending, there are cases of rapist going into prison, coming out and re-offending, so why can't that be the same for murderers? I just can't think of a case off the top of my head.
anyway, can we have another senario… (and this one has a basis in fact :?)
man walks into YOUR(hypothetical, dont worry 8O)childs school, kills children, and gets arrested.
Why waste resources in letting him live out a life in prison, when there is conclusive proof that he has murdered lots of people? Why not inject him with "the lethal injection" and do it the humane way.