People around the world go through tough times. For some the path is eased by good friends, family, "miracles", etc. For others the path becomes too difficult to tackle. In the end the person chooses not to fight any longer. As much as we should respect this decision, we should also remember that many people avoid that decision to end life and actually become happier in life. Sometimes you may be just an inch away from being saved.
Every person who has every felt disturbed and suicidal and did not take the step, probably feels good about not taking the step. So if you ask me personally I would differ and say we should help each other till the last moment, never give up.