Maid, I didn't pose that question because it is not that simple. That question is far too broad to answer. Like saying, "Does aspirin work?" You would need a lot more to narrow that question down to begin to answer it
But it is quite simple. We don't ask "Does aspirin work?", for sure. But we do ask "Do people suffering from X type of pain who take X dose of aspirin report better outcomes in terms of pain relief than those taking a placebo pill?". The same way we ask "Do people suffering from X type of pain who visit an osteopath report better outcomes in terms of pain relief than those visiting other types of paid manual therapist?".
Surely the questions you use as examples ("does osteopathy work?") should be "does osteopathy work for me?" , not "Does it work?"
I don't think so. People are immensely unreliable in reporting subjective outcomes (which is why, in the absence of reliable clinical indicators, pain is measured as "reported" rather than "measured" and there are extensive stats surrounding such reports, in order to normalise them). We will never ascertain truth if we rely on people to teach it to us from their personal conviction. The best we will ever achieve is "This person believes it to be true". That's not good enough to make any conclusions, although it may satisfy some peoples' threshold for value.
no one treatment or therapy works exactly the same for every person
Many do. Ibuprofen counteracts localised inflammatory effects, mediated by prostaglandin synthesis in response to damage. That's going to apply to everyone who takes ibuprofen.
I was not talking about opinions on holocaust denial and do not see why you have brought that into a discussion about an request for information on people's opinions of a therapy
Because you asserted the value of subjective opinion alongside or over medical fact. By extension, you should also value subjective opinion alongside or over other facts.
Also, I would like to know who commisions the scientific testing
Well, that's a very interesting question. Of course, it is usually initiated by those with vested interests in selling their product. This then generates a community-wide response (largely composed of those without vested interests) to analyse, criticise and repeat or negate such results.