Psy-Kosh: Hrm. I'd think "avoid destroying the world" itself to be an ethical injunction too.
The problem is that this is phrased as an injunction over positive consequences. Deontology does better when it's closer to the action level and negative rather than positive.
Imagine trying to give this injunction to an AI. Then it would have to do anything that it thought would prevent the destruction of the world, without other considerations. Doesn't sound like a good idea.
No more so, I think, than "don't murder", "don't steal", "don't lie", "don't let children drown" etc.
Of course, having this ethical injunction - one which compels you to positive action to defend the world - would, if publicly known, rather interfere with the Confessor's job.
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The theme of this post isn't very accurate, as large phenotypic polymorphisms in various other species demonstrate - e.g.:
Where did the reasoning go off the rails?
It isn't just the case of males and females where different alleles can form a truce. There's the whole phenomenon of frequent-dependent selection. Most people are familiar with this from blood types, and sickle-cell anaemia. Alleles with phenotypic effects involving disease resistance can be advantageous when rare and disadvantageous when common - resulting in them never going near extinction or fixation.
Also, this premise is inaccurate:
Gene B can spread if gene A is present at a frequency of 20% in the population - provided it is not deleterious in the absence of gene A. Sure, then the selection pressure maintaining it is reduced by a factor of five, but that's not necessarily enough to kill it off.
Finally, phenotypic variation does not necessarily depend on genetic variation. There's also the influence of the environment to consider. In general, the environment is quite capable of sending some organisms down different developmental paths depending on the circumstances in which they find themselves. This is known as phenotypic plasticity.
There are plenty of examples of phenotypic plasticity in humans - e.g. the effect is an important part of the reason why a Sumo wrestler and a racing jockey have different phenotypes.
That sounds like exactly the kind of situation Eliezer claims as the exception - the adaptation is present in the entire population, but only expressed in a subset based on the environmental conditions during development, because there's a specific advantage to polymorphism.
Those are single genes, not complex adaptations consisting of multiple mutually-dependant genes. Exactly the "froth" he describes.