It might go against the "just feed them drugs" mentality, but lots of times it totally works.

They had plenty of "traumatic stress" before the 21st century, in all parts of the world -- huge wars, conflicts, disasters, even genocide. But those involved (like older friends and relatives that have survived bombings and wars and dictatorship) also could grow a pair and snap out of it, and even thrive afterwards. I don't believe they had a different DNA or mental wiring back then.

  At an FDA hearing on March 23, 2006, I testified: “Saying any 
  psychiatric diagnosis ‘is a brain-based problem and that the medications 
  are normalizing function’ is an anti-scientific, pro-drug lie” [ 14]. 
  Yet this has become standard practice throughout medicine, for example,   at the American Psychiatric Association [ 15], American Medical 
  Association [ 16], American Academy of Child and Adolescent Psychiatry, 
  American Academy of Pediatrics, Child Neurology Society, American 
  Academy of Family Physicians [ 17], FDA [ 13], and virtually all US 
  government health-care agencies.

  Journal articles [ 6], press releases, ads [ 18], drug inserts, and 
  research informed consent documents say, or infer, that psychological 
  diagnoses are abnormalities/diseases. All patients and research 
  participants with psychological problems are led to believe they have an 
  abnormality/disease, biasing them in favor of medical interventions, and 
  against nonmedical interventions (e.g., love, will power, or talk 
  therapy), which presume, as is the case, that the individual is 
  physically and medically normal and without need of a 
  medical/pharmaceutical intervention.

  Currently, depression is not diagnosed via objective chemical
  tests, nor is treatment guided by any such tests. If depression did
  result primarily from a known chemical imbalance, such tests
  would likely be available and in widespread use, and depression
  would be easily and quickly resolved for most patients.

  Luckily, a number of effective interventions are available for
  treating depression. Such interventions include a variety of 
  pharmacological as well as nonpharmacological approaches, sometimes
  used alone and sometimes in combination with one another