I read once that PTSD was less likely to develop in people who were raised in stable homes with two good parents. I can't remember where I read it, so I can't site it for you. But I do believe that 100 years ago, people spent more time outside, working together, and they didn't shut out their spouses and children by looking at their phones. They ate meals at a table and talked to each other. No, not every home was stable, but I think the percentage was higher back when society sort of forced people to figure a way to work things out.