Ok my two cents worth (which is worth less over there)
I'm a fence sitter when it comes to this topic.
On one hand i realise that the system is flawed, and if one innocent person is executed then that is one too many. Plus i hear its fairly racially skewed and top heavy on death row, again a big flaw. Not everyone is given the same treatment, defense etc. So for that reason i can't agree with it.
But i believe through certain actions, people lose their "god given right to life, i'm human therefore i'm sacred" status and really become no more than a waste of resouces. Did anyone really lose sleep over Ted Bundy when he bought it?
We don't have the death pentalty here so its a moot point, but if someone had put a bullet in the back of Martin Bryant's head i don't think there would have been too much wailing and gnashing of teeth. Instead he is locked up forever, getting 3 meals a day. I'm not baying for his blood, but i don't care for it either.
http://www.crimelibrary.com/serial/bryant/