Oxfam spirits

Amazingly here's multi-millionaire Pat Robertson, ex US presidential candidate (1988) talking about demons attaching themselves to objects such as jewellery and clothes. Apparently it does no harm to mumble a quick prayer over your second hand purchases, you know, just in case...

Why is it that the credulous people parasites like Pat exploit never ever stop to think of the most obvious explanation for their supernatural anecdotes and myths, i.e. the people who claim these kinds of things to be true were either mistaken, lying or mentally ill?