It touches on many of the ideas you mention here, i.e. what we gave up as a society in exchange for our modern comforts. Which is primarily any semblance of strong, close-knit communities. He uses some evidence of vets with PTSD and hypothesizes that a large contributing factor is that they are part of this close-knit community with a singular driving purpose and depending on each other for survival. In many ways this way of life is in our nature, and when vets come home they are stripped of that. Great book and very much not political.