First obvious question is "do many Americans actually believe that"? How many Americans believe the moon landing was fake, and is that number a big number? I s

First obvious question is "do many Americans actually believe that"? How many Americans believe the moon landing was fake, and is that number a big number? I suspect what you are seeing is that a very small number of people have been given a very big megaphone, making them look like a much bigger group than they actually are. Plus you will always have a group of people who will say outrageous things "for the lulz" without actually believing any of it.