While the Straw Hats are the main characters of One Piece, being pirates, the crew aren’t the most morally upright heroes in anime. While they do save the day on more than one occasion, liberating enough kingdoms where it feels like a hobby, the Straw Hat Crew does have a penchant for things like thievery and deceit. At the end of the day, no matter how good One Piece's Straw Hats are, they are still pirates, and, to put it simply, pirates are criminals.