When the hospital SW was trying to unsafely discharge my DM (who has capacity, lived alone, quite disabled, and was completely incapable of looking after herself) they fully expected me to move in to care for her, possibly because DM led them to believe I would. I live 30 miles away, a FT job and other commitments, and it was never going to happen.
They then told me they would put DM in a taxi to send her home, because she wanted to go, and if I didn't bring keys they would get a locksmith to change the locks. Goodness knows how they thought she would get from the taxi into the house. I treated this with the disdain it deserved, but I can totally see how people can be bullied into taking responsibility for an unsafe discharge.
Ultimately it was a conversation with her Dr who said "Er no... she's medically fit to go, but no way can she go anywhere without a serious care package" that things became sensible.
A month at home between a respite stay and finally moving into her care home, which involved huge weight loss, falls, a gazillion phone calls to me, and another hospital admission, despite having carers in, showed her that this was the only viable decision. She's great now. Doesn't need to be there - except she would do if she wasn't.