Would you put a gun to this Stapletons face and pull the trigger? Would you look into his eyes as your put a slug through his brain?

If the answer to this is yes, then I would suggest that you should be in a secure mental hospital because you are no different than this fellow. Well, you may be worse because everybody knew Stapleton was a psycho. You are walking around, apparently free with these thoughts in your head. If you condone the use of execution, and we must assume anybody who would say such a thing would be willing to carry it out, I see no difference in you and him - other than the fact that one is delusional because one thinks murder can be justified by law.