What you want as a fit sane man , might be different when you are sick. I would hate to be in diapers and have a woman change them. But this happen when we were young. My brother was admitted to a nursing home with Parkinson disease. At first he wanted a male nurse to help him in the toilet. But now he allows anyone to help him. In the end he can not do it for himself. Did you ask his daughter wanted to do this or rather he died?
In the end this is a decision we will all have to make one day if we live long enough. I suspect most of us we not choose to be euthanized
the guys in question are just going blind. its perfectly possible for blind people to use the bathroom. this is the crux of the matter, the trivial reasoning behind the request.
people will still differ as to whether or not its EVER ok but it hapens every day and there is no putting the genie back in that bottle.