We certainly saw a lot of Vietnam vets that went through a whole lot less than McCain come home with PTSD. It seems McCain's sanity is off limits just as many other aspects of his life. And since they are off limits, we can't even flesh out if other stories about him are true or not. Such as:
THE STORY on McCain is that, as a USNA “legacy”, he finished with a class rank of 895 out of 899.
THE STORY on McCain is that he lost three jets out from under him before he was shot down, including one which hit high tension lines when he buzzed a beach, and another when he was returning home from an Army-Navy game, possibly after too much drinking.
THE STORY on McCain is that without his family name, the above two stories would have washed him out of flight qualification forever.
THE STORY on McCain is that his “fighter pilot bravado” caused the fire on the USS Forrestal that killed ~150 sailors.
THE STORY on McCain is that he collaborated with the Viet Cong for special, especially medical, treatment and was known to his co-prisoners as “Songbird”.
THE STORY on McCain is that when he came home from Viet Nam and found his faithful wife had lost her great looks in a horrible car accident, he went shopping around for a new trophy and started sleeping with Cindy while still married.
THE STORY on McCain is that he will do anything to get elected, including sucking up to the “Agents of Intolerance” and Bush’s billionaire base.
THE STORY on McCain is that he is a hot-headed, dim-witted child of privilege (like anyone else we know?) who is (equally) unfit for the presidency.
Obama detractors claim he gets a free pass because he's black, yet trivial issues like whether or not he wears a flag pin are MAJOR issues where he's concerned.
McCain's bonding moment with one of his former North Vietnamese interrogators, Bui Tin, in that picture certainly makes the collaborator story and "Songbird" nickname more believable. If not, well then you need to question his sanity.