You are right, they do save some lives, however; people look for medication the moment they feel a little out of sorts. Suicidal ideation is something that comes with not only depression. You do not have to be depressed to have ideation, far from it. You can have suicidal ideation because you sick of flashbacks, nightmares or no sleep. You may start thinking that killing yourself is easier than dealing with that crap day after day. You don't need to be depressed to have it.

Major depressive disorder is a part of the PTSD diagnosis, no disagreement with that one. Very few people though actually have major depressive disorder uniquely from the induced symptoms of PTSD. When you heal the trauma you remove the symptoms of PTSD. PTSD will always produce some minor symptoms or issues even when controlled, hence its incurable aspect.

If you get depressed though five times a year, does that warrant taking an anti-depressant for the entire year? For some they may be able to justify that.... for other they cannot. It is a personal thing and there is no right answer. The only right or wrongs to medication is side effects and then some of the nonsense physicians pull with patients in prescribing them, ie. prescribing two or three medications to counter side effects of a primary medication, is not ethical or warranted. The right answer is to change the primary medication to one that produces less side effects for that person, not prescribe more medications to create a concoction of disastrous proportion and a ticking time bomb waiting to explode and go wrong.

Those are about the only right vs. wrong issues.