Hmm, serious questions. I figure as a human, I'm just another animal. I'm evolved as a hunter gatherer as a result of probably being part of a scavenger species for ages. I'm smart, I live in cities and I have technology, most of which I use rather than create, but diet wise, I am what I am.
I keep fish. There, I don't just use, but have been known to catch. I guess that's the same urge those here who hunt or sport fish work with. In my case, I have tried to study the habitats and do as good as job as I can to emulate them, for whatever strange need I have to watch, study and try to understand fish.
I believe aquarists have a duty to keep fish kindly, on par with keepers of dogs, cats or other mammals. If you are going to do it, do it right. Provide space, good water, appropriate foods, appropriate companions, and just a good level of care. It's a bit twisted - if I follow my logic to its conclusion, I shouldn't keep fish in glass boxes at all, or I should turn my interest to habitat protection. I know it, just as I know I could get by on fruits and nuts. But I can't seem to do it -maybe it's that same mechanism that would allow me to kill and eat animals I respect and often admire, or the one that would let me participate in a war if that were needed.
I've never been interested in sport hunting, and while I was a skilled rod and reel fisherman when I was younger, I began to see things from the fish point of view too clearly. I'm not going to put a barbed hook into the mouth of a sentient creature with a highly complex nervous system. But, I ate fish and chips last night.
Mabel, the dog sleeping on my feet right now, is the kindest, gentlest dog I've yet come to know. But when she spots some prey animals, she transforms. She has befriended some deer, and they interact from a distance when they meet, but she is no longer kind and gentle when she sees a raccoon or a groundhog. We aren't that different. The nicest fish I ever kept here ate its babies sometimes, although it stopped that as it aged and learned.