I think the reason people don't end up killing themselves is that actually committing suicide is technically difficult, and terrifying. If one doesn't have access to specific drugs, how does one do it without making a horrible mess that their loved ones would have to clean up?
Even if one can somehow avoid the mess, suicide tells the people who are left behind that one chose death over them; it's a terrible message that most people, justifiably, don't want to send.
A medical decision that leaves little to no trail is a much better outcome for everyone.
The paper they report on further notes:
pain is not the main motivation for PAS (physician-assisted suicide)… The dominant motives are loss of autonomy and dignity and being less able to enjoy life’s activities.
I don't necessarily share OP's sentiment, and I think it's great that people don't go through with it, but I strongly believe that the option should legally be afforded to them.
>I will buy a gun, or jump off a bridge, or freeze to death, or O.D. on heroin, or something else if I have to. But I shouldn't have to.
Those are not equivalent to the experience of dying with assisted suicide.