I can somewhat understand this. I have IBS, and most people with a bowel issue will tell you that IBS is basically your doctor saying ¯\_(ツ)_/¯
Instead of getting help from your doctor, you go online and you hear about people finding relief through taking weird supplements, or eating only rice, or taking pre and probiotics of varying types. None of it has any proof, but it's better to try something than to struggle - and sometimes you're lucky or you find some short-lived relief.
The difference is that there often isn't evidence for these things working, whereas there is plenty of evidence out there that says that chiropractors are doing legitimately dangerous practices to your body. The difference is that someone is trying to make a profit from this lack of knowledge.