For some people this is their only experience with a lawyer and chiropractor might be when someone walks in, "slips" in their store, and they get sued. The chiropractor is one method the lawyer uses to run up the total. It's always a back pain that can never be fully diagnosed or treated.
Over the years, the chiropractic field as a whole has backed off from curing everything to being split between something in the neighborhood of a massage including joint mobility (which is fine), and the fraud.
Science research fraudsters could learn a lesson from them in how to get away with it