Anecdotal evidence: When our first child was born they wouldn't lie on one side, seemed restless and had trouble sleeping. Not knowing much about chiropracy party from it being "someone who does spine stuff" and having had it recommended we went to a chiropractor with our infant.

The chiropractor massaged their neck and made it say a small cracking sound and that was it. The baby wasn't happy about the whole thing but it actually helped, they slept much better afterwards and could lie on either side without issues.

I don't know if I would do it again, knowing the quackery behind it all, but as a layman I wouldn't be too surprised if you could actually improve some neck and back issues by popping things back into place. Cracking your neck feels great so having someone else crack it would be good as well?

Maybe there's a difference between European and American chiropractors? Around here they are educated at real universities, they are supervised and credentialed by health authorities and I've never heard anybody talk about them as treating anything other than spine and back things. The insane claims about mental health and cancer and whatnot seems to be more of an American thing.