What’s the Harm?

What’s the harm in believing in ghosts, believing in astrology, believing in religious fundamentalism, believing in vitamin mega dosing? Off the top of my head I don’t know, but whatstheharm.net does. This website does nothing else but provide examples for how irrational thought can cause personal injury or death. The website lists popular pseudosciences such as alternative medicine, the paranormal, conspiracy theories, as well as lists famous people who had their lives negatively effected or ended due to their dangerous irrational beliefs.

Jim Henson who felt ill for several days prior to his death, didn’t go to the hospital due to his Christian Science upbringing.
Bob Marley needed his baby toe amputated to save his life but his religious beliefs forbade it.
Wesley Snipes believed that he didn’t have to pay taxes, he had to pay $12 million and spend 3 years in prison.