If Japanese whalers are corrupt and Sea Shepherds are heroes, why are so many ppl against the Sea Shepherds?

Because what the Sea Shepherds themselves are doing is not right. Not so much their anti-whaling stance, but the way they go about trying to enforce it. I'm against the Sea Shepherds because I feel that their actions are unethical, reactionary, not at all a good way to increase awareness and understanding of the realities of whaling, and give a bad name to other activists who are also trying to stop whaling but are using more ethical and less flashy means of reaching their goals.