The protection of vulnerable peoples is really important, and I think the assessment of competency is vital to this.
We're talking about two different things here: the protection of the vulnerable people and making sure the person seeking assisted dying is really sure this is what they want. That's where the careful assessment process comes in.
I think you made a good point that maybe someone doesn't want to die, that they just want to be out of the situation they're in. That's where the suicide assessment might come in. If there are other options to help someone deal with mental health issues in a more healthy way, then those should be available.
However, the difference is that when you're talking about someone with an irremediable illness, the road is bleak, right? So the careful and thorough assessment is really important. The assessment by two physicians is really important. The patient needs to completely understand the consequences of this decision on both themselves and their family. They need to know all the treatment options that are available. I think the key to this is that the patient must freely choose this option after considering all the treatment options, and the request for the physician-assisted death must be made by the patient and not another party. When you're talking about protecting the vulnerable, there is a fear here that someone else might request the death of this patient, and we want to make sure that doesn't happen, so the request for the medication must come from the patient and not another party.