My personal beliefs have gone back and forth on this issue. So, i finally decided that if i'm not sure, it's best error on the side of life, and being opposed to the death penalty. But admit that I don't lose much sleep (actually I don't lose any) when someone who deserves to be put to death, is.
There are two arguments/comments that have swayed me; and that kind of go together.
1) It's easy to to be for the death penalty when you look at individual cases. However, when you look at how the death penalty is administered overall (unequally applied etc) it becomes easier to be opposed.
2) It's not about whether certain people deserve to die, but do we as a society have the right to kill. (talking about death penalty, not warfare or protecting ones home/family)