Our mental environment is a common-property resource like the air or the water. We need to protect ourselves from unwanted incursions into it, much the same way we lobbied for non-smoking areas ten years ago.
I don't believe in ghosts, or fairies, or crystals, or unicorns, or a man that can walk on water, or any of that non sense, I personally rely on logic, and have for the better part of my life.