Because there is a lack of evidence based findings that support chiropractics. 1 in 4 chiropractics surveyed agreed that there is [no evidence](https://chiromt.biomedcentral.com/articles/10.1186/s12998-015-0060-0) in the techniques that perform in their practice. There is no basis for the claims they can align your spine or fix a curve. There are not knots or kinks in your spine to get rid of. The results people see are temporary and mostly due to placebo effect. You go in expecting to feel better and so you leave feeling better. Other things they do like massages, steaming, heated whatever do help but still offer only temporary relief. For science based methods of improving mobility you should see a physical therapist.
There is a Science Vs. podcast about chiropractics that is pretty informative.
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