Mass_Driver comments on Semantic Stopsigns - Less Wrong
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What if you are trying to explain evolution to someone and he states "Evolution is just another religion." Is that a stop sign? To me it is, in the sense that the only reason to continue at that point would be to enjoy the sound of your own voice. The person has just signalled his membership in a tribe; you recognize that you are not in that tribe; and you recognize that he will not consider anything further you have to say on the subject, because that would be disloyal to the tribe. Global warming is a religion, taxation is theft, property is theft, healthcare is not a right (I'm not sure if the reverse is used as a flag, too), there is no peace without justice, "allopathic medicine"; there are a lot of them. I'm old enough to remember "The Soviet Union is a state in transition," too. (Sadly, it was in transition to total collapse.) All these statements are what Eliezer calls "Green and Blue" (I think--those are the two chariot racing team colors, right?) markers. I'm not sure if these statements are also semantic stop signs. Anyway, I think that class of statement is very different than statements like abiogenesis or prebiotic soup, because the latter statements indicate that the original topic has been exhausted. That line of reasoning has gone to its logical end, and to continue conversing, we must switch to a different discussion. Not quite the same thing as saying that "tribal loyalty dictates that I do not use reason to consider anything further you say on this subject."
I'd be careful before writing off otherwise polite and thoughtful people as irrational loyalists simply on the basis of a single semantic stop sign.
For one thing, you might be getting a false positive -- sometimes I say things like "there is no peace without justice," but I don't mean to cut off debate about political science; I'm just trying to call people's attention to the possibility that the people they see as violent troublemakers may simply be responding to a perceived injustice.
For another, even an intentional semantic stop sign might not indicate unthinking loyalty; it may simply indicate that your listener has erroneously concluded that there is nothing more to say about a particular topic. Some libertarians might think that taxation is theft, not because they refuse to listen to your counterarguments, but because they can't imagine a morally legitimate real-world government.
Finally, attempting to identify semantic stop signs with the motive of screening out those who are unworthy of further conversation will inevitably lead to improper rationalization; you will feel subjectively that someone is unworthy of conversation and then concoct a story for yourself about why the other person has been using stop signs.
Thus, it is better to ask people what kind of argument might convince them than to assume that people are irrational.