I suspect that if all those people against it actually took care of an adult disabled person, they would rapidly change their position.
On one hand, I understand the intent. Severely mentally and/or physically ill people get treated horribly. So in order to be able to tend to them as long as possible, their family may want to... put them in that state. It's an act of compassion in order to take good care of them, like pretty much nobody else would.
On the other hand, oh my god this is invasive. I feel there are so many other things that are wrong with this, but the only word I can come to right now is "invasive".
My higher thinking understands the logic, but my gut won't allow me to agree with it.
It's horrible and shocking that this is allowed.