You don't think they exist and influence US foreign policy? From what I've read they do exist. The issue for me is to what percentage they "control" things. Probably to some degree - the percentage is debatable - but it seems like they do exist and have an influence on the inner workings of our Federal government - which shouldn't be. I'm not an expert on any of this - still just gathering data and educating myself. . .
That they exist is not in question. The degree to which they influence things and have power over things is debatable.
As an analogy, I feel about those entities the way many liberals feel about Jesus.
They may agree he existed, but they don’t think he is The Son of God.