The actions that chiropractors use that end up injuring people were not mistakes. They're an intended part of the practice. Since it's not an evidence-based profession, that doesn't matter to them. It's not like someone went around and yanked a thousand spines and made sure nobody was paralyzed before chiropractic became a thing. No, there's not any body of evidence. On the contrary, modern mainstream medicine is based on which interventions tend to help people measurably.