Thanks for the examples and explanations. :-)
I'm not against killing as a last resort for self-defense (your own or people around you), but killing someone for protecting property, not life, is really something which I just can't agree. I'm not a Bible scholar by any means, but I do believe someone who does that (killing someone for protecting property, not life) will go to hell (if it exists, something I'm not sure). Matthew 19:24: "Again I tell you, it is easier for a camel to go through the eye of a needle than for a rich man to enter the kingdom of God." Harm criminals, even shoot them in the legs and knock them unconscious, but just enough harm to protect you and your friends and family.
I agree with you about death penalty for the same reason you stated: no justice system is perfect and sending an innocent to death row is, IMHO, something that should never ever happen.