I have sympathy for you on an individual level OP. It's never easy or straightforward coping with the effects of someone who is in the grip of an episode.
Having said that, if your relative is not subject to a CTO, then there's no obligation for them to continue to take their meds. I encounter hundreds of psychiatrists in my line of work, and sadly 'past behaviour as an indicator of future behaviour' is a mantra far too many of them adhere to in an absolute sense.
What's not commonly understood is just how awful some psychiatric drugs can be for the individual. Many of them are toxic, cause unavoidable massive weight gain, result in lethargy, loss of libido, disassociation, can cause involuntary movements and spasms, so on and so on. It's hardly a wonder a lot of people are desperate to stop taking them, and enormously frustrating to come up against entrenched and unhelpful doctors. That's before we even get to the stigmatisation and self-stigmatisation a lifelong diagnosis and medication can cause.
I know people who have been parked on Chlorpromazine for decades. It causes so many side-effects that most people on it have to take a cocktail of other medications just to control them. It can make people completely and utterly dysfunctional to the point whereby they have no quality of life whatsoever. So they decide they'd like to wean themselves off it, perhaps try an alternative antipsychotic, but lo and behold, they're met with a wall of 'we know it stops you having episodes, it's hellish to come off, better just to stay on it' from the doctors charged with their care.
So again, while I have sympathy for you having to deal with the unfortunate consequences, I really can't blame anyone for deciding they want to be free of psychiatric drugs. For a lot of people a diagnosis is difficult enough to come to terms with because of the labelling, stigma, and being immersed into a system that is both intransigent yet almost impossible to extricate yourself from. Then you have someone telling you 'you are unwell, you are never going to be well again, therefore you must take this toxic substance that just substitutes one load of symptoms for another'.
You have to question for whose benefit the drugs are prescribed.