> ... but you can't really argue that it is healthy behavior.
Of course you can. Suppose you've been told that you have inoperable pancreatic cancer and that the end will be painful even with the best medications (often true). How is it healthy behavior to suffer through such an end?
The bottom line is that suicide should be accepted as an option in some cases. The fact that it isn't (generally) accepted only shows that public ethical thinking is primitive, shallow and indifferent to the needs of individuals.
This is slowly changing. A few U.S. states have adopted assisted suicide laws to deal with scenarios like the example above:
You can debate whether or not it is morally justifiable to allow this to happen, but you can't really argue that it is healthy behavior.