Piracy is when you board a ship, kill or kidnap its crew and steal the cargo. Copying a file is nothing like that.

Unauthorized reproduction or copyright infringements is more scary and dramatic than theft in some ways. Just look at the punishment for copyright infringement vs theft. One is waaaaaay more severe. It's almost akin to saying "You stole his life!" Instead of "you killed him!" Since severity of punishment for copyright infringements is pretty much up there with murder.