... I would never do any of those things myself - but I don't see that as giving me any right at all to tell others that they can't if it's legal where they are.....
There are problems with this position and that is the (supposedly illegal - we will get back to that in a moment) actions that are taking place outside of the legal boundaries of Japan.. I can't carry a gun in Mexico even though its legal in the US.
Second, the treaties, agreements, etc... that govern the high seas are largely a joke. If its not in a nation's national interest (think Kyoto amongst others), then they don't agree. There isn't even consistency on what constitutes international waters.
That being said, the majority of the world has agreed on a ban on Humpback whaling since 1963. Japan nows says it needs 50 Humpbacks, 50 Fin, and 950 minke whales for scientific purposes -- and oh by the way, the agreement that allows for this says that they can sell the whale meat for commercial purposes. So while they might not be violating the letter of the law, they are clearly violating the spirit. Some might call it fraud...which is illegal in Japan.
But to the point, there is nothing but the 'court of world opinion' to enforce these agreements and so they go on....