[builditand]

I agree completely with you and I don't think it contradicts what I said, more it completes it.

It looks like a viral infection, yes, that's how it spreads: an evil payload wrapped in good ideas. It's a tool to control people even if it's not used everywhere all the time, even if sometimes it's used for good. And finally, yes, the believers have no intention to deceive; they are the ones deceived and since most of them are essentially good people they naturally want to spread the "truth" by telling others about it.