To most people...fish are nothing. you can buy them here and there penny here dollar there. Some people tend to think "if it dies, they'll learn" but no, they don't. they either leave it to rot for a bit then flush it, or they go get another one, or they flail scream and kick until they get their dog, cat, pony, pigeon, parakeet and lobster
I'm teaching my EIGHT YEAR OLD nephew about fish. And he knows, if he does not care for one of the bettas he gets with a heated 10 gallon tank and ALL needed accessories and the knowledge to start him off in the fish world... I take that fish back. And the tank. And my brother agrees with me on that. THAT is how you teach a kid with pets.
Then again, pets are supposed to be "family" pets, not "his, mine, hers, mine" to ensure everyone 1. wants them 2. cares for them 3. the pet doesn't suffer or die.