I think butcher would be perfect for a job like that.
If someone would do something as terrible as that, than they deserve to die that way. As for the innocent people, that is unfortunate, but at least they would have piece of mind to know that they hadn't actually done it. Sadly, thousands of people have probably died while being innocent. Regardless of how the death penalty is implemented, it wouldn't change that fact, so it's a non-point.
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