I guess mental illness is always seen as treatable no matter how bad it is because it's abstract stuff floating around in someone's mind, while for physical stuff people can understand more easily that stuff isn't treatable.
And it's clearly better for people to be throwing themselves off cliffs or stabbing themselves in the thigh looking for arteries rather than safe, peaceful deaths in the hands of medical professionals. /s
Swiss law states that a person must have mental capacity before getting a VAD. Mental illness throws a big wrench in that. That's why Pegasos generally doesn't accept anyone under the age of 50 solely based on mental illness.
The idea being that if you're 50+ and have a long history of depression and can prove it, you have mental capacity and aren't doing this on a whim or because you are temporarily super depressed. However i'm quite sure people in their late 30's and 40's have been accepted. We don't know how many because Pegasos doesn't like to advertise VAD's of relatively young people.
It all comes down to Swiss law and the issue of mental capacity. Even with all the red tape, I greatly admire the Swiss for allowing the VAD's of non terminally ill people. It's a great blessing for people who are not terminally ill but suffering from various diseases. I'd like to think Pegaos and other swiss VAD organizations want to be even more lenient, but that isn't possible with current Swiss laws.