I agree with your asessment. And I would add that they return from a world of structure, discipline, and honor to one without any of those virtues. The resultant anomie drives them to the margins of society and too often to suicide.
Family is everything. Mom, Dad, 2.2 kids and a dog in the backyard. The reason why suicides and mental disorders are higher than they used to be is as you say - no social structure.
If kids from broken homes have greater problems with education, relationships, and other normal routine activities, then how in the world is this disfunctional kid supposed to adapt to PTSD?