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It's not worth the energy expenditure to pretend these fanciful things are real. They either are or are not. Given the lack of convincing evidence and the excessive amount of radical claims each of these possess, it would server no long-term benefit to hold any of these as real without a doubt (except telekinesis! :P)

Return question: why do you believe in any one of these?
Or even deeper: why do you believe?

"It's not worth the energy expenditure to pretend these fanciful things are real. They either are or are not."

But they're so cool.