Because their training also includes the scientifically bankrupt "osteopathic manipulative medicineI'm sorry and I don't say this lightly but you should really just shut up.
https://en.wikipedia.org/wiki/Osteopathic_manipulative_medic...
In an article published in the New England Journal of Medicine in November 1999, researchers concluded that osteopathic manipulative medicine and traditional drug therapy resulted in equivalent resolution of lower back pain in a nearly identical time frame. The difference was that participants receiving osteopathic manipulative medicine required less pharmaceutical intervention. The advantage of osteopathic manipulative medicine was a diminution of adverse drug reactions while the disadvantage was the greater amount of physician time required for each patient.[22]
A 2005 meta-analysis and systematic review of six randomized controlled trials of osteopathic manipulative treatment (OMT) that involved blinded assessments of lower back pain in ambulatory settings concluded that OMT significantly reduces low back pain, and that the level of pain reduction is greater than expected from placebo effects alone and persists for at least three months.[23]
The National Institutes of Health's National Center for Complementary and Alternative Medicine states[24] that overall, studies have shown that spinal manipulation can provide mild to moderate relief from low-back pain and appears to be as effective as conventional medical treatments.
You are the worst kind of debater. You say something wrong, are called out on it, then you change the entire topic. Only you're wrong about that new topic too, so you cling to it to death. So now you're in the position of arguing against the American Medical Association, the National Institute of Health, the New England Journal of Medicine and frankly thousands of studies.
You are a colossal fool.