My personal feeling is that we all have a 'time to die' for whatever reason. Maybe we have a 'task' to do and when it is done (however young) we are ready. Of course sometimes 'people' cut that time short. So many people die from other peoples (or their own) carelessness from car accidents, pollution, man-made diseases, man- caused lack of nutrition or sustinance, or abuse.But if none of this affects us we have a time when we wear out and move on. I have always felt that in some curious way the process of dying in itself has a purpose, I know it is painful for some mentally and physically, I don't think we can choose to circumvent it without missing a part of life.
Therfore NO I think to at least try to talk them out of suicide
or try to help them want to fulfill their natural lifespan must be ok. WE hear to much about peoples rights these days and too little about their responsibilities. End of sermon!!!