I mean, that does sound pretty crazy. Specific wars are often ill-advised or largely pointless, but "stop doing war" presupposes that all other countries in the world will also "stop doing war", otherwise what you're suggesting is just unilateral surrender under the guise of stopping war.
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.
> presupposes that all other countries in the world will also "stop doing war"
No it doesn't. But making efforts to stop it ourselves is necessary to achieve that. Same reason it's worth doing nuclear disarmament: because not disarming guarantees nuclear war eventually.
Stopping doing wars doesn't mean not having a military capable of wars. It means not starting them. The US hasn't been involved in justified military action since the 40s.