I think that we should leave those people the choice to decide if they want to die or not. It might seem silly but most of them will prefer to die then to spend all their lifes in jail. Whereas, others will always prefer life. The act of the death penalty is cruel, in my opinion, you might justify it saying that the person is evil, that she is bad but the thing is, you're still killing someone!!So you're not doing anything better then they are! How do you want to tell those criminals that killing someone is bad and that they cannot do it if on the other side, you kill them? You can't forbid somebody to do something if you do it too...I know it's a bit confused and hard to understand but that's my point of vue...
That's all then!