[Handsome Creepy Eel]

There are undeniably some conditions that are either bullshit (mostly in the field of psychiatry) or some that are strongly influenced by placebo effects. But most conditions are objectively measurable and are not improved by placebos or nocebos.

Go handle a book covered in smallpox scabs or get bitten by a rabid dog or a flea carrying bubonic plague and see if placebo effect will protect you.