Actually, calling a copyright infringer a pirate just makes the act sound cooler than it actually is. Plenty of cracker groups in the 80s and 90s latched onto it for that very reason.
Of course, these days it has lost most of it's potency- positive or negative. Calling a copyright infringer a pirate is given no more thought than calling a custodian a janitor.
The use of the term as a negative propaganda tactic has failed miserably.