Chiropractors are OK if they keep to the spine. Locally we have one Quackopractor (I love that word) who buys an hour a week of radio time to claim that adjustments and nutrition can cure anything and vaccines shouldn't be given to kids. I say lock him in a room full of old iron lungs that don't have to be used anymore because of polio vaccinations.
MD's are okay as long as their pharma reps keep them "informed" as to what to prescribe for the next fad disease.