Something fic writers might be interested in:
At the panel a person brought up the idea that Frank Castle is suffering not just from PTSD of his family but of "Moral Injury". I just wanted to share some info about it in case people didn't watch the full panel or missed it entirely. I think there are a lot of indicators in the context of Season 1 that can potentially attribute to both Frank and Billy suffering from moral injury.
http://moralinjuryproject.syr.edu/about-moral-injury/















