Chilepepper,
There are many healthy, well adjusted people who suffer from chronic depression due to imbalances in neurotransmitters and chemical activity in the synapses. Many of the Selective SEratonin Reuptake INhibitors have saved the lives of many people when used properly and with regular medical supervision. We need not have deep seeded problems or traumas to suffer clinical depression.
these drugs are a God send for many.
I do believe that they are often prescribed when perhaps some psychotherapy, diet change or other non-drug treatments may be the ticket.