He is certainly a liar and scumbag now. Why would I doubt that he was a liar and scumbag during his stay at the Hanoi Hilton?
He might have had a heroic moment once. That was wiped clean at the moment he became a traitor.
Vietnam and moneyed interests needed MFN trade status.
To make that happen, he closed the door on the POWs who were still in captivity. He treated those families like garbage, and sealed the records.
He is no hero. He is a herpe, for sale to the highest bidder.