For starters, whales aren't tool users. So it'd be something of a surprise if evolution had programmed them to feel joy when their offspring use tools. Humans, on the other hand, seem to get a bit of a kick out of teaching other people (especially kids) to do things which makes a lot of evolutionary sense given how strategically central tools are to our species.
I feel that people who study animal intelligence started with the dictum "don't assume similarity to humans" and immediately interpreted it as "assume dissimilarity to humans".