Talk about unintended consequences…
The wiki for the Unabomber has him traumatised as a child after treatment for hives.
If I'm ever incapacitated, I know the doctors can't say "let's not save this one. we could keep them alive, but it's better for everyone to not do that". That is insane to me, and it makes me deeply distrustful of the whole institution.
To give non-Americans a sense of how things work here: if a doctor suggests that you have surgery and it's not an immediate need, you should seek the opinion of several other professionals to see if you really need the surgery or if the doctor just likes doing that one. Also quackery like homeopathy and chiropractory is allowed in the open.
Smart Americans learn early which parts of the medical system can be trusted and how to get maximum benefit out of them. But I can see how someone might not want to go through all that effort, tune the whole thing out, and tune out vaccinations along with it.
I see this as a trauma response to knowing how abusive the system can be unless it's handled very delicately.
They absolutely can, if they know that that's what you would want and someone from your family isn't actively trying to stop them. That's why it's important for people to have DNRs and/or make their wishes known to multiple family members.
In France too, that is absolutely what I recommend. Never undergo a non-emergency potentially life-altering medical procedure without getting the opinion of at least another specialist. And also that if you go see a surgeon, their recommendation would almost always be a surgery, even if there are others, less invasive path of treatments.
There are indeed some Chiropractors who are quacks, and there are elements of the practice that are not understood well or even contravene our traditional understanding of science and medicine - however, if not for Chiropractors I’d have suffered needlessly. Visiting a Chiropractor and getting adjusted after Airborne operations has brought me back to full operational form. I woke up unable to turn my head on multiple occasions, getting adjusted was the only relief I got after my PCP’s only help was painkillers or the referral to the “quack” (as you put it).
It may be better to do the slow yoga approach, but there are times where I am in a lot of pain for days in a row. Having a trained professional to look at my body, find the tense areas and apply heat to loosen things up before giving it a good push seems like a valid mode of treatment for what can be debilitating pain. Similar results could probably be achieved from massage, but a masseuse will never give the joint a push to try to reset things, and in my non medical opinion it seems like that could be a useful treatment at times.
The whole basis of chiropractic is pseudoscience at best or actively rejecting the scientific method at worst. Part of what they do is likely effective for some. Studies suggest it's about as effective as massage, physical therapy or exercise.
Now, there are absolutely some "good" people in the industry that know and accept that chiropractic orthodoxy is pseudoscience, but nevertheless feel that spinal manipulation helps with some conditions and don't make grand claims or claim to be able to treat non-MSK conditions. It is probably unfair to describe those individuals as quacks. But textbook definition chiropractic as an industry is absolute nonsense.
As I said, studies do show it is as effective as other forms of manual therapy for MSK pain, which is to say it can be fairly effective.
I think it's probably the case in the USA that people call themselves chiropractors who, in other countries, would refer to themselves as physical therapists, because people know what chiropractors are. Sort of like branding. I've read about US having "evidence based chiropractors" who are, in effect, what in the UK would be called osteopaths - which is still alternative medicine but with far less woo than chiropractic.
I have been to chiropractors, osteopaths and others and did find it effective, but then I also found massage and physical therapy effective. I think just having someone really get in there to give your muscles a rub and crack your joints makes you feel good for some currently not known reason.