Not at all. He's saying that what likely landed many, though probably not all, of them in jail ("snapping") has its basis in neurology, but flat out states that that response is due to numerous outside triggers, including things like stress, and that our responses to those triggers are something we can control once we recognize they're pressing these deeply wired buttons.

That said, I do agree, the story as told here is still a bit black and white for my taste. For me it was the heroism angle that threw me... E.g., maybe the majority of decorated vets are men because, until recently, only men were eligible for combat roles.