Code of honor
They won’t talk about McCain especially to you unless you were there
Decision made by the real heros who established a chain of command among the POWs. What went on in Hanoi stayed in Hanoi except for what came out in debriefings
which Senator McCain fought very hard to discredit or keep classified
But if you ever meet any and ask you will get the distinct impression of contempt
As I said, I know several, personally. I have asked and you are quite right. One or two don’t care much for McCain, but that attitude may not come from Hanoi. Like many professional military officers, they don’t like how he leveraged with POW status into a political career. I’m in that crowd, but I can’t speak to his POW days.