As long as they actually use every part of the whale I don't see a problem with whaling. So there aren't many whales left. I'm sure nature will find a worthy substitute for this useful animal. Just like it found a replacement for the Dodo, dinosaurs and the most essential animal of all time: the Quagga.
I'm sure it will find a replacement for humans too after the next flood.
The difference is Human's couldn't of saved the Dodo or the Dinosaurs. And those species weren't anywhere near the level of intelligence Whales are at. They live in close, family groups for their entire lives. They are intelligent beyond any other animal on the planet, with exception to Humans and Dolphins which are closer than you might think.
Dinosaurs were wiped out my a natural disaster. Not hunted brutally.
Dodo's were only indigenous to one Island I think, and killed off by it's inhabitants. Again there is a huge difference in hunting for food to survive, then slaughtering thousands of Wales then feeding the Wale meet to school kids.
I think it's disgusting to see the extinction of a species coming, and still not care and continue wiping it out.
Small tribes hunting Wales to survive, is very, very different.
If you think every piece of the Wale is being used by the Japanese then...lol. The Wale meat is actually poisoning people who eat it as well due to the massive amounts of Mercury and other harmful toxins within the Whale.