You're strawmanning I think.
My interpretation of the parent comment is: Americans should stop aggressing other countries, slaughtering the population, and then publishing scientific breakthroughs on treating ptsd among the killers.
I'd say the comment says nothing about wars of survival, which is not what veterans have ptsd for. No one is 'doing war' at America.
Game theory and history say otherwise. If you want to be a fool, have at it. Just don't expect the rest of us to go along or respect you because of it.