You will see the same blinkered approach across the spectrum of any number of fields. Once people bought some hucksters message hook, line and sinker they are loath to admit that they've been had. Politics, products of all kind etc. it doesn't matter. Once they fall for the message of the hucksters they are certainly not going to admit they were gullible, ill informed or just plain stupid. It's not just the USA, but they are really GREAT at it.