I would be very sad if someone close to me did so but that shouldn't stop them from doing it. I consider this a basic freedom of being a living creature. If you don't have the power to end your life then do you really own it?
And I think suicide prevention is still very important, since many people who attempt to commit suicide regret it afterwards.
Technically I guess this is assisted suicide. He had untreatable cancer in the lungs, he'd just gotten pneumonia and he and the doctor knew it wasn't going to get better. So he decided his time was up.
But from what I understand this is not the common case. Rather it is people who struggle with their emotions[1][2], which can pass or be treated. For those I think it's important to not give in to their temporary wishes, and to help them get past it.
[1]: https://www.nrk.no/osloogviken/truls-om-selvmordsforsoket_-_...
[2]: https://www.nrk.no/dokumentar/xl/trigger-warning-1.14716227
The lengths psychiatric institutions and society is willing to go in order to deny you the choice of living is absolutely disgusting.
For most people, suicide is a very temporary state of mind, and many people who are prevented from committing suicide are glad that they were stopped.
Given the very final nature of the act, perhaps it's best to have some cooling off period before a state sanctioned suicide can be authorized?
Most people consider other people who want to kill themselves in a point in time as having temporary insanity so stopping them in the act is ok, because it is not 'them'.
It is also ok to want to stop people wanting to long term kill themselves like stopping adictive behavior.
Using force here might be controversial but we can just do the same playbook as addiction.