If you start with a belief, strongly enough held, and build circumstances around it, cherry picking the evidence and presenting it just so, and then, just to make certain it will hold, discredit anyone who disagrees or presents evidence against it and shame them as a pariah.
That, my friend, is why it is so important that we all have a good, open dialog. We are not like them. But if we are, in any way, we will change that.