This is a very American-centric question to ask. Short answer is the American Medical Association has run a decades long smear campaign against chiropractors.
While chiropractors in the Palmerists tradition are effectively quacks, there are many more practitioners that take a science based approach and receive far more training in musculoskeletal and nervous system anatomy than medical doctors.
Reddit also seems to be full of shills that jump on every chiropractor related post to rant about the horrors of chiropractors.
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