"our only reason not to catch for fun is human "morals"."
Exactly !
That's the core of what I'm saying. It's the morals of the humans that are important, I've not been talking about the morals of the fox, fish, or money. So, when I say that it is immoral to make sport out of killing or harming an animal, it's the humans who are acting immoraly. Come to that, it's the humans who make it a sport.
All countrysports people wish to sustain their sport species and will manage the environment to the best effect for that intention. They will also enhance the survivability of other species by that action. They end up as conservation managers to greater effect than thos people who are opposed to counry sports.