Same reasons people now don’t know that things like Homeopathy don’t work in the slightest. Regression to the mean and the placebo effect. People usually seek help when they are sickest and people also usually get over sicknesses. If you get bless with leaches at the peak of a sickness then get better afterwards because that was the normal course of the sickness, you’d probably attribute that to the leaches (or the homeopathic pills).
Latest Answers