Who's to say even the Doctor is correct?
Had a small stroke and the doctors were so sure it was a heart attack. Then almost a year later, I have a full blown stroke, same but worse symptoms and they finally "get it" and we have a "correct" diagnosis. The second angioplasty did more damage to my body (pinched/torn groin nerves) than the stroke did as I got the TPA (Clot Dissolver) in about 1/2 an hour (fastest application in the US) and all was well within 10 hours. If they had left out the angio I could have been back to work full time in a couple days but the nerve damage kept me out for a couple weeks and left me with a limp and numbness.
Are the Quacks any less capable than the Doctors? I can't really be sure.....
For many years, "Doctors" used to prescribe a type of Mercury for Syphilis, they used to "bleed" patients to cure them, they used electric spark and light generators to "cure" patients.
The issue is that the medical "proffession" isn't exactly sure who's wrong and who's right.
Thats why they call them "Medical Practioners", because they are always practicing.