LogFAQs > #980297583

I think the main reason the Kanjuro plot twist was so shocking is because a good character betrayal like that is so outside the realm of what happens in a shonen manga like One Piece. I mean it's just taken as a given that good guys are good guys and bad guys are bad guys, and they're always honest. If they change sides they do it honestly and on camera and dictate their literal thoughts on it.

But a bad guy, playing a good guy for like 300 straight episodes, only to reveal it as a con later? That is pretty messed up. Way more messed up than anything else in One Piece.