There's a lot of naivety (or is it dishonesty?) in this thread.
When it comes to safeguarding, relatives obviously can't always be trusted to act in the best interest of their dependents, be they an old person or a child.
But the same could be said about "professionals" and institutions.
These do tend to be a lot better at covering their collective arses, though, so they can fail a lot of vulnerable people very badly for a very long time before any whistle-blower rings the alarm bell, and any inquiries ensues, and lessons be learnt, etc.
Blind faith in institutions (schools, hospitals, care homes, ...) can be lethal for the vulnerable people in their care. Nanny state does NOT know best. It's made of fallible people with a vested financial interests in their job being as easy as possible and their cock ups never, ever being picked up.
Allowing a care home to decide what's best for an old person sounds like an obvious conflict of interest: they have a clear financial incentive in keeping the person in and cashing in the care home fees.
Similarly relatives could have vested financial interests (e.g. if they are due to inherit).
Surely an independent third-party would be more suitable?