The reach is in how far you're applying it.
> I agree. Hence why I wrote: "To find out-group features to be desirable requires external pressure - media, education, etc.". Government/media/propaganda can easily undo our natural programming. But that doesn't mean that underlying natural programming doesn't exist.
But then you can't say the natural programming is the reason. It's one factor and not one of the bigger factors.
> No. That's exactly how it works.
> To show how powerful culture is, you are denying science because it goes against your "programming".
It's not how it works, and I didn't deny any science.
Do I seriously need to pull out a genetics textbook? If you keep a steady population and have people marry at random, the number of copies of any particular recessive gene will stay the same. Mix up everyone's eye genes and you'll have a billion people with at least one copy of the gene for blue eyes. If two people with one copy have children, about a quarter of them will have blue eyes.
Even if you were making a strawman of ultra-extreme outgroup preference, where couples want to pair brown and blue eyes above all else, you'll still have carriers marrying people with blue eyes and having blue-eyed children. Even if you remove all of those, once you have a single generation of kids that all have one brown gene and one blue gene, they'll mix back up to give you kids with blue eyes.