Better hope the phone battery doesn't go flat, though!

- Jack Handy

There is a large proportion of society that does the exact opposite of this - they never think of the question - if I believe this, then does that mean this must also be true?’

For example people who believe in ghosts or visit mediums to try to talk to dead relatives. If either of those two things were true, what are the implications? I meet very few people that believe both those things that have gone any further than ‘I’m going to a medium to try to contact my dead reletive’

I wouldn’t see those people going any further if vampires exist either

Example: I see a guy on the bus. He has four shopping bags with him, filled with a lot of stuff. I may be able to make an educated guess and presume that a quantity such as that means he has a family - or a wife at least. 

Look at someone's hands. You can tell if they are a manual or clerical worker. I could set up a business - "Robbie The Mystic Mind Reader" - and say to someone, "You work indoors and don't do much lifting." It doesn't make me mystical, I'm just using facts and observation to come to conclusions.

I have never been to an event with a medium, but I know people who have. Those I do know have mocked it afterwards (I think some went specifically to mock such things). One person who attended an event told me that the 'medium' kept throwing things out there about dead relatives - don't we all have dead relatives? - and other vagueness. And for those who are gullible, they probably give something away - "Yes, my grandfather is dead, you are right!" - and then the 'medium' builds on that.

Yes. Intimately connected with the Blood Libel against Jews.

And not only in times long ago. The tropes continue to this day.

"In a world where vampires exist, I'd think people would start questioning what they do or do not believe in." 

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In a similar vein, Ever since I was a kid I've always been puzzled by the idea that we were supposed to be scared by ghosts. Seeing a ghost to me would be like the greatest thing ever. As in proof of after-life, the immortal soul. That people are never really gone. It would be a cause of celebration to me.

But of course the flip side of it is that the desperate hope for that, is exactly what mediums rely on. (And depending on your views, perhaps what organized religions exploit too.)