I stopped reading when you said, "what is it with Americans and their obsession with conspiracy theories?" Nice generalization..
Actually as an American, I think it's closer to home then you are willing to admit. We have tv and radio shows dedicated to conspiracies. Along with someone attempting to create a conspiracy for many of the cases similar to this one.
Here is a decent list of conspiracies, many if not most revolve around America in some fashion. That't not saying conspiracies don't expand outside of the US but it's foolish to think we aren't in the lead in some aspect relating to conspiracies in general. That also doesn't mean Americans as a whole believe in them, I think Americans are most likely the largest source for them.http://rationalwiki....piracy_theories