BlindIdiotPoster comments on Harry Potter and the Methods of Rationality discussion thread, part 28, chapter 99-101 - Less Wrong Discussion
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I know Harry is just a kid, but his reaction towards unicorns don't seem very rational to me. Remember, Harry became vegetarian for a while when he was afraid animals could be sentient. And now, he speaks about massively killing unicorns, magical creatures whose sentient status isn't very clear (like with phoenix), for a "temporary" stop of death at a cost of "permanent side-effects", without inquiring how temporary temporary is, what are those side-effects, and how sentient unicorns are. Without measuring those three parameters, there is no way to know if utility(killing unicorns in St Mungo) is positive or negative.
What leads people to even suspect that unicorns are sentient?
Sentient is not a binary thing, but a more fuzzy ones. The sentience of apes or newborn for example is hard to quantify in a binary way.
Many magical creatures have a higher level of sentience than mere animals. Some are fully sentient like centaurs or acromentulas, some are half sentient like phoenix. Even magical owls or cats tend to be more sentient than their mundane counter-parts.
So it really seems from 1. and 2. that the level of sentience of unicorns has to be carefully evaluated, to be able to figure out if the harm done to them would be worth a "temporary cursed" life, it depends of the values of the three parameters : how sentient they are, how "temporary" it is and how "cursed" it is.