“What is faith? If you believe something because you have evidence for it, or rational argument, that is not faith. So faith seems to be believing something despite the absence of evidence or rational argument for it.”
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Knowledge is generally considered a good thing so, presumably, knowing more about how the U.S. thinks and operates around the world is also good.
I don't think nationalism is alone holding the field it's in contention with a lot of different things.
That's a central part of philosophy, of ethics. What do I owe to strangers? What do I owe to my family? What is it to live a good life? Those are questions which we face as individuals.
In a democracy, citizens pass judgment on their government, and if they are kept in the dark about what their government is doing, they cannot be in a position to make well-grounded decisions.