The famous curmudgeon H. L. Mencken once quipped that a person could never go bankrupt underestimating the intelligence of the American public.

On a similar note, I don't think a person could never go bankrupt overestimating the credulity of the American public.

 Nietzsche wrote about the 'Will to Power'. 

I think an interesting topic might be the 'Will to Believe'.

People appear to have a strong desire and need to believe in something.

I certainly do, but not being highly credulous myself, I'm very selective regarding what I choose to believe.