If you're still a birther it's you who have the problem, you see you are incapable of accepting reality, regardless of the evidence.
Why We Believe Lies, Even When We Learn the Truth - Newsweek
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Some people form and cling to false beliefs about health-care reform (or Obama's citizenship) despite overwhelming evidence thanks to a mental phenomenon called motivated reasoning, says sociologist Steven Hoffman, visiting assistant professor at the University at Buffalo. "Rather than search rationally for information that either confirms or disconfirms a particular belief," he says, "people actually seek out information that confirms what they already believe."
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Of course given the veracity of the internet you can actually find verification that the moon is made out of green cheese.
It's a very uncomfortable thing from a psychological perspective to confront ones closely held beliefs with an antithetical point of view. Sometimes it's just too hard to make the psychological or intellectual leap to the realization that perhaps what you believe and why might be wrong. Like the quote says, rather than rationally process the info it is far easier to say "ya, but ....".