Fair enough in the UK these people are effectively untouchable, but in some parts of the world people can be, and have been, held accountable for following orders when doing so led to avoidable harm.
Following protocol leads to some twit deciding that diabetics not only don't need to, but shouldn't, monitor their blood glucose levels, and GPs attempting to enforce this by refusing to prescribe the means to do so.
Following protocol has lead to significantly worse events.
When people know something is wrong, in their judgement, they shouldn't do it, regardless of whatever orders they recieve or protocol says.
The current system, in the UK, is nuts. 'Highly trained' doctors with lots of experience being told they can't do basic things no matter what their own judgement says. It's a system designed to control, to produce mediocracy, to reduce the few good medical people down to the level of the worst, by assuming everyone is incompetent, when only some are.
As far as government is concerned doctors cannot be trusted, so rules are set, straight jackets fitted, their views are ignored, in everything, from their medical opinions in general to those re someone's ability to work, to how many hours it's safe for them (the doctors - added to clarify) to work.
Yes there are bad doctors, I have one, but the system is designed not to improve them but to remove the good ones, or at least limit them, make them as bad as the bad ones. Make them incapable of doing a good job. Making the system so no one, in power, who actually makes the decisions, can ever be held accountable - hence NICE.
All patients die. Some just haven't done so yet.
As to knowledge, it seems obvious that any patient with a chronic illness will eventually gain more knowledge on that condition than any generalist like a GP. A GP will have much more breadth, but specific knowledge? They don't live with it, they may see it for 7 minutes once every few months. Of course they know less than the patient.
As a patient it's nod, smile, leave with whatever prescription they dain to honour me with. And then buy the rest of my needs privately. Works well, at least it will do until the money runs out.