1 John 4:1 - Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.
Blind faith in God is good. But blind faith in man is dangerous. God gives each and every one of us a brain, and some of us have common sense. I say some of us, because common sense is not as common as it should be. With that being said, there always have, and there always will be ruthless people who's sole purpose in life is to take advantage of the gullable. While the responsibly should rest on the shoulders of those who choose to listen, fraudulent, false prophet's are just as guilty for misleading people in the name of Jesus as the people are for not discerning the difference between the truth and a lie.