Thank you.

...there is a limit to how many children you can sacrifice without significant objective average fitness effects for those within your culture. Anyway, plenty to think about.

Can imagine arms race in crazy beliefs lead to selection of super crazy beliefs which lead to selection of mega crazy beliefs and so on. At some point should bump into objective reality. E.g. If an intermediate goal is to please a bloodthirsty god, then child sacrifice is justified, but...

Tools (mind etc.) that I use for subjective selection, my evaluative technology so to speak, have been selected for. Of course, they are imperfect & I can end up believing in sorcery because it "seems" to be effective, but such effect should be bounded by objective reality.

PS. Contrast zero-sum games, where player *outcomes* are opposed, but *incentives* might be aligned. A game like matching pennies is both harmonic & zero sum (opposed outcomes, opposed incentives), but you can also construct a zero-sum potential game (opposed outcomes, aligned incentives).