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[–] Le_Squish ago 

People feel like it is unfair competition. No one wants to see their valuable members poached by another team.

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[–] TAThatBoomerang 0 points 1 point (+1|-0) ago 

There is a possibility, but I don't think it's far-fetched to suggest that it's a biological instinct.

Humans (and many animals) have for example an instinct to not be sexually attracted to those who are very similar genetically (in other words close family). Another study showed that men react with the same "disgust" reaction when seeing homosexual men, regardless of how the people stated they felt about homosexuality. The researchers were not able to explain why, suggesting that this behavior is another biological instinct.

Reacting negatively to coupling "too far" apart from your genes could also be caused by a biological instinct. For example watching someone have "intercourse" with a hyena would bring disgust because the human is trying to mate too far away from their genes. Same could be said about for example a subsaharan and a Scandinavian person. They are not as genetically far apart as a human and a hyena, but they're still significantly further apart than a subsaharan person + a subsaharan person.

Come to think of it, the researchers really did an oopsie by just including people who said they were against interracial couples. Had they included people regardless, they could have suggested that this behavior is biological instinct. But then, this publication would probably get shut down.

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[–] Le_Squish ago 

I used to have an old politically incorrect book about interracial marriage in China and they found that interracial marriage patterns weren't random and people may have a natural sense of if they should breed with the group or outside of the group.