If you read the package inserts for the medications they basically tell you this. The stats on there (and those will be from the best possible tests they did, they are allowed to pick the most favourable and leave out the bad) show these meds increase suicidality and do practically nothing to decrease depressive states.
Being depressed or feeling depressed may not even be a clinical condition. What if some wealthy pharmaceutical moguls sat around a table and thought up a name for a state that we all get into, a tablet that would lock you into neurological changes that would prevent coming off them, even forever? How rich they could become all while being praised for helping people.
Just imagine of an industry was that corrupt, can't be .... or.... can it and there are libraries worth of books on just that subject dating back to the industry's very origination?