The Orca Whale: The Ocean's most cunning serial killer?

We need to start taking these demon beasts seriously

1. Orca's are the most skilled and cruel hunter of the seven seas. The footage attesting to this is abundant
2. There's no biological reason why the orca's haven't gone after humans. We are edible and no more boney or gross-tasting than other creastures.
3. Thus, it is possible that the Orca's have been killing us and covering it up
4. Consider shark attacks. It is a fact that nobody has interviewed a shark after they have killed a human. Nobody has asked it questions like, who is your boss? Were you forced to do this? What are your motivations? Thus it is an open question if Orca's are forcing sharkis to clean up after their dirty work.