The points you just brought up are part of the few exceptions that are bound to happen in just about any and every situation that could ever arise. Sure, there are people that might be able to be cured, but that might is never a definite. You will never hear someone in their right mind say they can definitely change a convicted murderer for the better through intensive psycho therapy. That is just the problem with therapy, there are no guarantees.

You said as long as their will power is sufficient. Clearly, in my opinion, if someone can commit such a heinous crime, such an injustice to humanity, then their will power is in an unstable state. Of course, there are anomalies, and there always will be, but that doesn't mean the whole system should change..

How many times psychiatrists have been blatently wrong? How about how many times they have been obviously correct? I'm sure that number more than heavily outweighs the preceeding.

Talk is cheap, and liberal talk, citing the government budget, is even cheaper. Besides that point, which is even more moot than all of Tyrannicide's points thus far, and isn't at all a valid debating point, the Death Penalty is simply something that is not utilized enough. Why would you even want a rehabilitated serial killer that raped 12 year old and younger girls, then mutilated their bodies living out his life in jail? Now how is that reasonable?

With all the technology and education in the world today, those exceptions will surely shrink in size, and possibly to the point of non-existent. That is just the plain truth.