I can understand taking risks with radical sports, traveling, etc. Someone can weight the benefits (ie adrenaline rush, sense of accomplishment, etc) against th

I can understand taking risks with radical sports, traveling, etc. Someone can weight the benefits (ie adrenaline rush, sense of accomplishment, etc) against the risk of losing their life. I can't understand why someone in good health (mental and physical) would choose to end their own life. In weighing the benefits of having life vs the benefits of not having death i don't see how someone would choose the latter over the former.