I don't see how what I said supports your point. I don't think there is much evidence that pitchers that threw at guys got thrown at in return. Maybe I'm wrong on that but I don't recall it. By what you are saying Gibson should have a lot of HBP as a batter since opposing pitchers would be protecting their guys by throwing at him.
I don't think that today's HBP numbers reflect guys "Head hunting". I think more folks were thrown at intentionally back in the day and that more guys are hit unintentionally in today's game. Some of it is guys not having great control, some is guys crowding the plate, some are guys with gear leaning into pitches so of it is higher velocity and movement being harder to avoid.
We had a fair number of HBP in the Yankee series, I think you can only make a case for one of them being intentional.