As I said, I'm not suggesting that we're saying all suicide is preventable if someone is seeing a psychiatrist. That's not what I was saying.
You're asking a bit about what the threshold is for defining something as irremediable. I don't know if that's a question for the profession to answer or for society to answer.
In some ways, there are concepts in law that talk about probability. My clinical background was as a psycho-oncologist at Princess Margaret Cancer Centre, and when patients have cancer, you can anticipate what the outcome may be, but you don't know 100% for sure in many cases. At what threshold do we say something is completely irremediable or not?