According to those who support the notion of suicide it is a very heroic act.
If it is heroic, then it should be done by the suicide himself.
If they don't have the ability to kill themselves then they shouldn't be allowed to degrade the medical profession by encouraging or requiring doctors and nurses to participate.
Instead they should hire a paid assassin to kill them.
That's a lot more dignified than degrading an already degraded profession and making a mockery of the Hippocratic Oath.
You are correct.
It is not a decision which should be brought to bear upon anyone else but the one still in posession of their faculties.
Also, if the people who want to die would do it themselves, they'd not drag family members into it to do it for them. To me, it's the height of selfishness for a person to try to force that person's family to kill that family member or force the family to make the decision to kill that family member.
Doctors, nurses and family members should not be dragged into the mess if a person wants to suicide.