evand comments on The noncentral fallacy - the worst argument in the world? - Less Wrong
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I'm not sure it's that tiny, especially once you're using the "steel man" version of the arguments; i.e. things like "Schelling fences" do not often appear in the reasons given for the disagreement, but that can still be what it boils down to.
People who object to abortion may be objecting to a weakening of the social stigma against the murder of innocents - that social stigma performs a useful function in society, so allowing anything that could be described as "murder of innocents" is perceived as bad, regardless of whether that thing is in itself bad.
In other words, even if words are hidden inferences with leaky generalizations etc. - social norms are still defined in terms of words, and so "pointless" debates over definitions still have their place in discussions of morality. Questions that shouldn't be morally relevant ("is abortion murder?") become so because of the instrumental value of social norms.
So yes, sometimes pulling out a dictionary in the middle of a moral argument may be justified. The discussion can then turn to something more useful, like "is it worse if the norm against murder is slightly weakened, or if women have to keep children they don't want?".
The "a fetus is a person" attempt to frame the abortion debate actually seems like it would weaken the norm against killing innocents. Most people agree with the rule that it's generally wrong to kill an innocent person, which is a relatively clear bright-line rule. If pro-abortion people can just say "well, a human fetus doesn't count as a person so the rule doesn't apply there" then the rule against killing a person remains relatively clear and simple for them. But if they have to count a human fetus as a "person" then the rule against killing a person becomes messy and complicated for them - they have to say "well, it's often wrong to kill a person, but there are various exceptions and factors to weigh."
Anti-abortion people might like having the abortion debate take place on those grounds, with a human fetus counting as a "person" by definition, because of the rhetorical advantage it gives them within that particular debate. But for the broader goal of establishing shared support for the "sanctity of life" it is counterproductive to cast the abortion debate in those terms. If you use a dictionary to remove the flexibility/disagreement in defining the domain where the rule applies, then that flexibility/disagreement gets shifted into the content of the rule.
It might be worth noting that abortion proponents cluster with death penalty supporters, gun ownership advocates, and generally have a poor record on human rights for e.g. GLBT people. I'm not convinced that they hold the sanctity of life to be equally important for all people generally.
One person's modus ponens is another's modus tollens.
It would be if it were true.
Those three groups do not tend to cluster, nor do they have the record on human rights that you ascribe to them.
I think it's pretty obvious that evand mean "abortion opponents," not "abortion proponents." Make that correction and the rest of the comment is accurate.