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Has sermonizing ever in history moved the mean on virtues, for a group larger than a few hundred, for more than 1 generation? I’m inclined to think any such effect is transient. Persistent effects can be attributed to tech making it easier to do a right thing than a wrong thing.
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Huh! I think they serve a useful purpose: they're the group-level analogue of the individual action of sharpening and clarifying your own beliefs and priorities. Admittedly, just as with the analogous self-talk, they're frequently abused.