The reason given by the person in question was politeness. I'm not talking about whether or it's polite to change this setting.
> For instance if it is considered that an adult who's not autonomous can express consent and doesn't want to take their pills, social workers normally shouldn't (and legally can't) force them to take them, even if it's good for them.
That's because 'I want to die' is a valid reason. Or at least it should be. I doubt that social workers actually come to their conclusions from that framework. They probably do it like you said; simply acting against autonomy is itself bad within their framework, but this is inconsistent with society's behaviour at large.
Similarly, if GP's grandmother's reason was 'I want to receive random spam calls and calls from telemarketers' or 'I have friends overseas who might not be able to reach me', then I'd have nothing to say. Those are valid reasons. On the other hand, perceived potential impoliteness, which actually isn't, is not.
Yeah, I don't think that's a good reason neither. Now, it not being a good reason is not a pass to act against her will either.
I think OP needs to convince her that it's a bad reason first.
> That's because 'I want to die' is a valid reason. Or at least it should be
That's a very reasonable reason not to want to take a pill, but that's not even necessarily the actual reason. Often the reason is completely unknown. Possibly the person refusing the pills doesn't really know why they are refusing it / doesn't even have good reasons. The actual reasons behind the refusal doesn't theoretically matter much in whether they should be forced to take the pills. They should only matter to convince them that they should take the pill for their own good. (the reality is probably more "dirty" than that though)
> simply acting against autonomy is itself bad within their framework, but this is inconsistent with society's behaviour at large.
Possibly, but, depending on what you mean:
* society at large acting against autonomy isn't necessarily a good thing / a good justification for doing it. Society at large needs a fix.
* fighting fire with fire is not necessarily the right approach
Given that they're working of incomplete information or in otherwise difficult situations, it's understandable why they've taken the shortcut to 'just don't work against autonomy'. The reality that they're taking another shortcut through dirtier solutions doesn't surprise me.
> * society at large acting against autonomy isn't necessarily a good thing / a good justification for doing it. Society at large needs a fix.
Society definitely needs a fix in this area, but I'm unsure whether or not it's viable or even reasonable to expect complete autonomy (or even as complete as one can imagine until it starts bumping into other rights or major problems. Compare freedom of speech). It's probably something worth thinking about.