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felzix comments on The Octopus, the Dolphin and Us: a Great Filter tale - Less Wrong
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Not necessarily. A culture that include the concept of a "raiser" - an octopus with the job of raising the babies, and passing the culture on to them, without mating at all - can avoid that issue. The "raiser" would also improve his average genetic fitness if he is a sibling of one of the parents, since the children would then all have approximately one-quarter of his genes.
If it's not enough to kill off the species, evolution generally won't drop the feature.
Orson Scott Card uses this dynamic in the later Ender's Game books.
The world-building in the first Ender's Game book can be made roughly consistent if we assume that all the adults have turned their decision-making over to a computer program (which does not eat the solar system Because Magic). But the later books have no standard or intended models.