I don't really know how I feel about the death penalty as a policy.
On the one hand, I completely understand the reasons why putting criminals of arbitrarily violent level X to death, make sense. Arguments would involve protecting citizens, resource savings, and deterrence among others. I don't agree with those positions, but do see valid logic in these positions.
On the other hand, which I find myself leaning towards, the State should not have the right to take your life. Period. In my view, the only thing that you ever truly have ownership of is, is your life/body. It is not the property of the State.
Here is the problem: I don't feel that incarceration is a right that the state should have. Of course I do think it is the state's duty to protect citizens, however it does not necessarily follow, that the means it accomplishes this by, is to incarcerate others.
Sending you to prison for 50 years is about *this much* (holds fingers really close together) better than the death penalty in my view. Depending upon how long it has been since I have seen Shawshank, I may argue the Death Penalty was more humane.
I have no problem with having rules for societal participation, and I would agree that quarantining violent criminals from the populace is an appropriate strategy. But, we would (in this philosophical utopia that I am discussing) be better served by "deportation". Obviously, this isn't possible, but it is the natural arithmetic of my personal world view.
All of that aside, the simple fact that mistakes can be made makes me very hesitant to side on the pro-death penalty side. Not that it is possible to give back time people have served, but killing them wrongly is certainly worse.