Eliezer_Yudkowsky comments on Undiscriminating Skepticism - Less Wrong
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Proposed litmus test: infanticide.
General cultural norms label this practice as horrific, and most people's gut reactions concur. But a good chunk of rationality is separating emotions from logic. Once you've used atheism to eliminate a soul, and humans are "just" meat machines, and abortion is an ok if perhaps regrettable practice ... well, scientifically, there just isn't all that much difference between a fetus a couple months before birth, and an infant a couple of months after.
This doesn't argue that infants have zero value, but instead that they should be treated more like property or perhaps like pets (rather than like adult citizens). Don't unnecessarily cause them to suffer, but on the other hand you can choose to euthanize your own, if you wish, with no criminal consequences.
Get one of your friends who claims to be a rationalist. See if they can argue passionately in favor of infanticide.
Despite some jokes I made earlier, things that could arguably depend on values don't make good litmus tests. Though I did at one point talk to someone who tried to convert me to vegetarianism by saying that if I was willing to eat pork, it ought to be okay to eat month-old infants too, since the pigs were much smarter. I'm pretty sure you can guess where that conversation went...
Option zero: "There's an interesting story I once wrote..."
Option one: "Well then, I won't/don't eat pork. But that doesn't mean I won't eat any animals. I can be selective in which I eat."
Option two: "mmmmm... babies."
Option three: "Why can't I simply not want to eat babies? I can simply prefer to eat pigs and not babies"
Option four: "Seems like a convincing argument to me. Okay, vegetarian now." (after all, technically you said they tried, but you didn't say the failed. ;))
Option five: "actually, I already am one."
Am I missing any (somewhat) plausible branches it could have taken? More to the point, is one of the above the direction it actually went? :)
(My model of you, incidentally, suggests option three as your least likely response and option one as your most likely serious response.)
Well, not quite option two, but yes, "You make a convincing case that it should be legal to eat month-old infants." One person's modus ponens is another's modus tollens...