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.
However, I do think John McCain has behaved dishonorably as a U.S. senator. My own eyes and ears tell me that.