Feds crack down on copyright infringement

The story about the German kids who managed to hack into the computers of various celebrities is quite fascinating. Obviously the celebs are no better than the rest of us when it comes to "click this link, omg this is too freakin' amazing" -> spyware.

What struck me the most in this article though was this following paragraph:

The alleged crime came to light only when fans of Kelly Clarkson, another targeted singer, tipped her off about unreleased music available on the internet. She informed the police, triggering an investigation involving the FBI and the German Federal Police Service. 

What the hell does FBI have to do with investigating possible copyright infringement? That's like sending fully armed US marines to retrieve a bicycle that the neighbor kid stole. Absolutely fucking ridiculous.