The book "Tribe: On Homecoming and Belonging" discusses similar dynamics with returning combat troops, and others that have lived through war or extreme challen

The book "Tribe: On Homecoming and Belonging" discusses similar dynamics with returning combat troops, and others that have lived through war or extreme challenging scenarios. The surprising finding is it's not the memory of the event that causes PTSD/depression, but returning to "normal" modern, atomized and isolated life of relative peace and stability.. and losing the excitement, adrenaline/thrill of events arguably humans have been adapted to thrive in: challenges and struggles, especially alongside a group of people facing same challenge together. Many people have been polled as being happier in for example war time London facing bombing raids, death and destruction, than peacetime after WW2. It's a good read.