take advantage on people that actually believed them

it's up to the individual to believe in something or not. By your logic we should shut down all the churches, because they make people believe things that don't exist, or at least there is no tangible proof of them. Word "fact" in most cases, is just a word that describes some event that most agree on. Unless you're touching something, unless you're there and seeing it with your own eyes, everything is a hearsay, not a fact, unless you believe it's a fact.

©Of course, that's just my opinion and I could be wrong :)