While I acknowledge that there are a few genuine cases of PTSD, the fast growing numbers are an indication of how "soft" western societies have become in the last forty years. Countries like Canada and USA have become so entrenched in having an easy lifestyle with more leisure time and less actual work.
Lifestyles are geared to obtaining material items that reduce individuals having to work or use their own strengthen - electric an can openers or electric toothbrushes,  self-drive vehicles that parallel park themselves, all of which require little o none physical effort and certainly no mental effort.  
Thus mental coping skills have been impacted as well resulting in serious health problems. To deal with mental problems, medication as become a booming industry promoted by the huge international drug companies. In reality many RCMP officers resort to developing mental health problems as an escape goat when they are faced with heavy work loads. And once prescribed they're addicted.