Or by "pressure" from family members. Especially when money is involved!
It's not difficult to imagine a scenario where some poor old soul agrees to press the button just because s/he felt (or, more likely, had been led to believe) that s/he was "in the way" or "just being a nuisance"!
Where laws are most needed is to protect the most vulnerable members of society.
What's next for our sick world ... "celebrity deaths" on YouTube?

For what it's worth, my own take is that if a person is (or, more importantly,
believes themself to be) reasonably
compos mentis, then s/he can take whatever action they choose.
As long as they are prepared to take the consequences. I mean this in a general sense, but include suicide as well.
Death is no big deal. It is simply the last act of living. In a civilized society, folk should be treated with dignity and respect at
all times. Personally, I find great distaste in the way that the dying are often "fiddled about with" in their final hours. Let them die in peace!
My "bottom line" is that I believe that a person has the right to choose the manner of their demise ... just as long as medics have nothing to do with it! Here in the UK, people are continually banging on about their "human rights" ... so what about this one? But (as with the other thorny issue ... that of abortion), let's bring it out from the realms of seedy hotel rooms and back-street practitioners.
"Consumer choice" has been the cry in the High Street for many years now ... so why not here as well? Personally (as in all topical issues), I welcome the debate, and look forward to clarity from our legislators. It needs to be conducted in an up-front and open manner. Everyone needs to know where they stand from the legal, moral, and
human points of view!
No to legalized euthanasia.
Yes to legalized suicide!
PS: I guess you are referring to
this news item, Roger.