This is not an isolated issue. This is how we treat animals and other humans (regarding the harpooning, we only do it figuratively to other humans, not literally).
Whales are the farmers of the sea. They fertilize the open oceans and produce more food than they eat. Especially the biggest ones, like the fin whales Japan has decided to hunt again. So if you like sea food, maybe don't kill the whales.
I don't mean to be that guy but, whales are delicious. And you get approx 3500kg of meat (low estimate) from a minke whale, whereas you'll get about 75kg from a commercially farmed pig. Meaning you have to kill 46 pigs to get the same amount of meat as 1 whale.
Both pigs and whales are intelligent and emotionally developed animals. Whales live free and normal lives up until the point of their harpooning, whereas pigs are kept in filthy overcrowded conditions and kept alive with antibiotics because they wouldn't last long without them. They are of course eventually killed, but unlike cattle they don't get a quick death from a bolt gun to the head. No pigs are asphyxiated with carbon dioxide. They spend the last moments of their tortured existence choking to death.
That doesn't take into account the massive environmental impact of large pig farms. Because pigs eat more nitrogen rich food than other farm animals, their feces leads to over nitrification of anything downstream and eutrophication of waterways.
So if you are sitting there chomping a bacon sandwich and bitching and moaning about whaling, take a long hard look in the mirror, because the pig farming you support is immeasurably worse both ethically and environmentally.
If there were fish artists, do you think they would draw depressing pictures of whales obliterating entire colonies just to feed themselves, or humans doing the same for entire ecosystems?