Why not volunteer to offer respite care to persons w/her condition, DullWitch, in order to see for yourself how it is to care for a fully grown person w/such a disability, before making a judgement?
She lays on her back all the time.
She cannot sit or even hold her head up.
Her family wants to care for her for as long as they can but the fact is, they're going to get too old and infirm to do it one day and probably die before she does.
So they made some tough decisions about what to do.
I really feel for parents in this situation.