Minke whales are not endangered.
Exactly, estimates are around a million Minkes worldwide, stable populations.
Remember, Minkes are among the smallest of baleen whales, "merely" 10 tons as contrasted to the big Blues nearly 200 tons.
And Blue Whales at maybe 25,000 are still only 10% of their original populations.
Minkes seem to be doing OK and a few hundred harvested by Japanese will make no difference to their population numbers.
As for Sea Shepherds... well the word "quixotic" comes to mind.