People don't see fish the same way we do. Most people would like to believe that fish don't feel any pain, so they can justify hooking and releasing them for sport. Other people are confused to find them sold at a pet store as well as the grocery store. Most people will never have an emotional attachment towards fish. Fish are said to be so stupid that one lap around the tank and they have no memory of the place from which they started.
I can go on an on, but my point would be best "served" by the following video of a beautiful puffer. This video has over 1 million views. They laugh at us when we try to explain otherwise.
Warning: this is a puffer being prepared for a meal. Like as in a restaurant. May not be suitable for people who love fish, especially puffers.
[YT]aC2eCxHReLo[/YT]