I see your point. However, these are the lawyers of the party that sold their consumers the license to play the game. Remember, you don't actually own the game. You own a license to play the game on the medium you purchased. If the company that sold you the license also says that copying the game to a different medium and playing it there is not part of the original license, they kind of are allowed to say that.

Note: I'm not saying I like it! I'm just saying it is the way it is.

This "you have no rights but what we decide you have" view of ownership is what Nintendo would like you to think, but it's untrue in varying degrees depending on jurisdiction.