Hospitals alone kill close to 100,000 Americans alone each year. https://www.propublica.org/article/how-many-die-from-medical...
Chiropractors are good: 1) Personal experience. They have helped my spine recover multiple times, in record recovery time. 2) Modern medicine consists of prescribing drugs, or high risk surgeries. Paralysis for life is a real risk. 3) If you get a great one, they will add years of pain-free time for your life
Chiropractors are also bad: a) There are some 'religious schools' founded by 'bodies for Christ' aka Maximized Living that make some interesting claims. Unfortunately these are becoming common b) many new chiropractors have poor technique. This often goes back to the previous point. c) Unless the person is really good don't let them mess with your neck. There is a growing link between neck manipulation and strokes, especially when 'fast techniques' are involved. https://www.researchgate.net/profile/Deanna_Rothwell/publica...
TLDR; This doesn't mean that Chiropractors are bad. There are many many great ones and it really works.
There are many quacks who drink the cool aid. They are mostly new graduates.
Modern medicine's approach to back and neck pain is utterly subpar and medieval. There are many quacks there too, and they kill a lot more every year.
And the medical community also disavowed Surgery as 'quackery' not too long ago: http://mentalfloss.com/article/66664/how-uneducated-butchers...