It is like most sports, some people who participate are idiots. I have bowfished for carp because although I don't eat them I knew people who did and they screw up the nests of bass and sunnies, I have also bowfished for cat fish, not very successfully. I do enjoy bow hunting for squirrels and grouse, yes I eat them.
I also eat gar though I was line fishing for them, they have a very mild, flakey meat that is best when you lightly steam it, then flake and bone the flesh, then make it into balls with a little cornmeal, milk, egg, spices, and shredded cheese, before deep frying it.
It looks like those clowns were just trophy hunting.