Personal anecdote, but I do get a sense of disconnect between crazy-chiropracty and the basic physio stuff.
I had some back problems when I was a teenager, and went to a place that branded itself as a chiropractic clinic, but on reflection and in comparison to the stuff I've since learnt about chiropracty it seems more like it was just a plain old physio. There were just minor procedures that resulted in popping noises like knuckle-cracking, that honestly relieved stress. I had an x-ray taken and was given the common sense advice of adopting an exercise routine, that my spine was a little twisted to the side from hunching, and could be easily taken care of if I just had some stronger back muscles.

This is in Australia mind you, but from that time I got the sense that chiropractic care was just a sub-discipline of physiotherapy. It was only later I heard about all the crazy pseudo-science stuff, none of which reflected my own experience. My chiropractor never mentioned any of the energy stuff, or how other problems could be cured by spine "futzing", it was just - "your back is a bit crooked - I can crack it around a bit for immediate relief but if you want a long-term solution you should be exercising." Isn't that just physiotherapy? But if so, why did he call himself a chiropractor?
Like I said, it's a personal anecdote, but more importantly, it's definitely not testimony that "chiropracty" as described by Simon Singh has worked for me. Rather all I'm saying is that there must be a diversity of chiropractors out there in terms of how much they believe and how much they're just practicing basic physiotherapy.