I love to hunt, both with a bow on land and a speargun in the water. I'm just not a fan of killing anything that you don't intend to eat, give to others to eat, or use constructively in some other way. I don't count a big set of jaws on the wall as constructive.
So the pictures of alien looking fish from South America or enormous catfish from, Thailand, or wherever don't generally get me riled up because I am pretty sure that they were eaten, and probably shared by many many people.
I have a hard time believing that the gar was eaten, though. I know that the flesh "can" be eaten, but it usually isn't by people with access to anything else. As I recall, gar live a long time, so that fish might well be over 50 years old. I sort of feel the same way seeing pictures of enormous sharks killed just for the jaws and a photo. Same with the old safari pictures of the proud hunter with a dead lion or tiger.
Of course self preservation is a whole 'nother thing. If it's him or me, I'll pick me every time.