Answer from a distance would be ego. Outdoor editor of one of the largest hunting/shooting publications of his time. Also probably had his ass kissed for some time because of it. From readers to outfitters who wanted a writeup, he was a big man in his own mind and came to think he was more knowledgeable and influential then the rest. He obviously thought the way he did and his ego made him believe everyone else should also.
From my limited exposure to the man, I'd say you are right on with that assessment.
Big ego coupled with a less than large intellect coupled with not really being a "gun guy".
