If you think about, why would 'they' want to implement deception on such large scale?
I would understand it if everyone lived on earth forever, then it maybe be worth putting so much energy and effort into deceiving the whole world? But everyone dies eventually, there is not enough time to come up with the plots, implement them, etc. And what for? Wouldn't you think that those people be rather enjoying what world has to offer, instead of constructing strange plots to take over the world, etc.
I am trying to put myself into those people's mind...
They have enough money to do whatever they want for the rest of their lives, they have power, ... Nothing to worry about. Why bother with deceiving the whole world, 'fake' messiah, 'mind control', etc? Perhaps, boredom?
I guess another possibility (like with Hitler)is being part of a spiritual ideology. Still hard to comprehend that type of mentality.