The fuck do you mean prove it? Just read that shit.
-Enemies get turned into allies through campy plots and tears? Check.
-Random power-ups with no explanation? Check.
-Mysterious government/authority body hovering over the main cast with super powers? Check.
-Random tear-jerking and the power of friendship? Double check.
One Piece is standard shounen shit like Bleach and Naruto. Doesn't mean it's bad, it just means it's nothing special. You guys need to get off the rubber cock.