When the Straw Hat Pirates brought down Arlong Park, they were in the right. They did it to save their friend Nami and the rest of East Blue. Arlong was a menace, and his reign of terror needed to be stopped. If the Arlong Park arc is viewed in this context, the Straw Hats are the heroes. However, something about this story changes based on the context of future arcs. The Fish-Men and Merfolk are among the most tragic races in One Piece history. They have been the victims of oppression and slavery at the hands of humans for centuries.
Source：https://www.cbr.com/one-pieces-arlong-park-arc-aged-weirdly/
