Professionals are trained to realize what they can do something about and what they can't. They learn their own limitations, and what is "their best" in any given situation, hopefully. People have the ultimate decision. If someone has their mind made up, there's a chance you can change it, give them enough hope to get through the night, but not always.

Most people don't want to end their life, they want to end their life as it is, and have a better one.