To me, seeing a Lion take down and eat a gazelle on a documentary show is natural, they have to eat, they can't wait around in hope that some one is going to come and drop off a box of steaks for them haha but with captive animals its different, they don't need to hunt and kill. (not all of them anyway)
I mean, if certain types of fish need to see a moving prey item to trigger a feeding response and can not be pellet or frozen food trained then I have no problem with that. For me its not so much about people wanting to watch their animal eat a live feeder, each to their own hey, for me its about if its necessary or beneficial to the animal when pellet food is far more nutritious, dose not have the risk or parasites or disease and dose not leave a bloody mess in the tank lol.
Have a good one. Cheers-
Dazz