Because you are plain wrong. A role playing game is a game in which you play the role of a person, you decide what they do and in fact become the character with your actions. Best example would be AD&D (pen and paper, of course) or MUDS and Mushes. In Diablo II you decide absolutly nothing, the only part of the game in which you decide something is in the action part if you kill such and such monster first or not. The rest is only stats that you pile up with each levels and skills that you decide to upgrade or not.
Granted, there is a very minor part of the game which may be referenced to RPG. However, this part of the game can't possibly add up to more than 10% (and I'm feeling generous). Every single games in existence can have a hint of RPG, yet we don't call them RPG either.
Diablo II is an action game, plain and simple as it rely on quick reflexes of the player to make the character survive. Everything else revolving around the game is made so you can bash the next monster more efficiently until you ultimatly kill Diablo (or Bhaal if I remember his name right, for the extention). Nothing else matter, the story can't be changed by any means, you don't have a choice to do such and such quests because if you don't the game is simply locked up until you do. You don't even have a choice of doing such quest or such other quest to decide the way your character evolve when the story unfold which may then have been enough to say that there is enough RPG element in this game to grant the title...
Diablo II, in facts, is way more similar to an adventure game than a RPG, you simply guide the PC to the end of the story. It is of course in no way an adventure game either.
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