There are countless examples of «expert physicians» who have given extremely bad recommendations over the years — from insistence in the 1950s - 60s that cigarette smoking is not harmful, to cardiologists in the 1970s recommending potent (and toxic) anti-arrhythmic drugs for the treatment of benign PVCs — until randomized controlled trials documented increased mortality in the treatment group, to numerous
unnecessary surgeries that used to be commonplace (such as tonsillectomies, elective C - sections, spinal fusion for
back pain, etc., etc..