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Re:Mammals can absorb oxygen through their intestines by cgriswald on Friday May 14, 2021 @03:58PM (#27159035)
I did not get the sense @newsbinator was trying to remove the question to an entirely hypothetical realm, but stipulating that we somehow have this knowledge with hypothetical 100% certainty is fair enough.

(1) is unknowable. (2) and (3) describe many, many people that are not generally considered to be serial killers (e.g., a soldier). If a 'known serial killer' were experimented on and died, (2) and (3) could also describe the researchers doing the experimentation.

We could modify (1) to say, "...and we have 100% certainty of this." But I guess really not certain what value the question has if we basically require 100% certain knowledge of the events and the internal state of the perpetrator. A 'no' answer would mean 'no' in the real world, too, but a 'yes' answer doesn't really tell us anything about the real world.

Re:Mammals can absorb oxygen through their intestines by newsbinator on Friday May 14, 2021 @04:11PM (#27159157)
For the sake of simplicity, I used "known serial killer" to mean somebody we are certain is a serial killer for whatever reason. Let's say they were at a parade, in front of 100 eye-witnesses, and live tv cameras, going around killing people, and then confessed to it to arresting officers and in court.

Somebody who is doubtlessly (and perhaps unrealistically) guilty of committing one of our highest crimes, for the sake of simplifying the question.