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This shouldn't surprise anyone. It's basic psychology that should be taught in school.

https://en.wikipedia.org/wiki/In-group_favoritism

Edit: And it's something to keep in mind with politics. The other side is not nearly as evil or stupid as you think they are, nor is your side as righteous or clever.

Edit 2: It also fuels racism and xenophobia.

Edit 3: Which reminds me, PG's essay on identity: http://www.paulgraham.com/identity.html

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Or maybe it's as simple as dividing responsibilities. If they believe Puerto Rico is not part of the US then obviously other priorities take over. Kind of like on the airplane where you are supposed to put your own oxygen mask on first.

> This shouldn't surprise anyone. It's basic psychology that should be taught in school.

Sure, but maybe they should also teach that Puerto Rico is part of the US in school?

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