“Systematic reviews of controlled clinical studies of treatments used by chiropractors have found no evidence that chiropractic manipulation is effective, with the possible exception of treatment for back pain.[8] A 2011 critical evaluation of 45 systematic reviews concluded that the data included in the study “fail[ed] to demonstrate convincingly that spinal manipulation is an effective intervention for any condition.”[10] Spinal manipulation may be cost-effective for sub-acute or chronic low back pain, but the results for acute low back pain were insufficient.[11] No compelling evidence exists to indicate that maintenance chiropractic care adequately prevents symptoms or diseases.[12]”
There’s a difference though. Doctors are trained professionals so when they kill someone it’s by accident (hopefully), but quack doctors are not professionals, when they kill someone it’s 3rd degree murder.
There’s a difference between making stuff up and an unsuccessful medical procedure, but the only way to tell the difference is if the person has a reasonable chance of actually being successful I.e. a medical professional.
That’s why surgeons don’t commit assault. But some random person coming at me with a knife does even if the end result is still my chest cavity being opened up.