I don't know much about Troy Davis, except that he died tonight by lethal injection. He could well have been a cold-blooded killer who shot a cop to death, but I'm in no position to opine on that. This isn't about Troy Davis, anyway.
This isn't about morality, either. I don't have any real objection to a murderer being repaid in kind.
What I believe, though, is that any state that hands down a sentence of death will eventually err. Somewhere, sometime, an innocent person will die.
Capital punishment should exist only in an infallible system. Maybe that's what our latest cowboy of a presidential candidate thinks he has down there in the Lone Star State. I would argue that there's no such thing, and the practice, states' rights be damned, must be abolished forevermore.