Murder is wrong, period.
That's all there is to it.
I'm against the death penalty 100%.
Just because they killed someone, that does not give us the right to kill them. We, as human beings, do not have the right to take away the life of another. No matter the cause. Plus, why kill someone who committed the unthinkable, giving him the easy way out? Why not just put them in jail and let the convicts do the dirty work? Let the criminal live with the inevitable guilt and horror that will haunt him for the rest of their not-so-great life.