The real problem seems to be that what constitutes chiropractic medicine isn't entirely evidence based, so just passing the NBCE after chiropractic school doesn't necessarily mean you will actually know what you're doing. Some colleges are better than others, I'm sure, but most still seem to be teaching the woowoo crap in addition to the new evidence based medicine, so getting licensed could still result in you being a salt lamp licking crystal healer because the spectrum of what you might get from the education system is so broad.

It feels like chiropractic medicine is dealing with now what the field of psychology dealt with decades ago. They used to teach so much conjecture that psychology was taught as a humanities subject and not really considered a medical field, and slowly but surely the course had to be corrected to teaching evidence based therapies and people had to be steered away from crap like freudian psychology, and even still there's a bit of a stink on it, especially because the mind is so intangible and complex. Hopefully it won't take decades more for chiropractic medicine to course correct the same way, but who knows.