OK, now tell me how you can remove this file from BitTorrent (it's Fedora 18 KDE)
magnet:?xt=urn:btih:14f146cdfaef83951ca9d3ac647e18e1977d1367
I'll wait
magnet:?xt=urn:btih:14f146cdfaef83951ca9d3ac647e18e1977d1367
I'll wait
Even when the former is actually impossible, a court could still punish for the latter. "Ha ha ha I use technology to cleverly show how futile your orders are" is not the kind of thing you want to say to a court with broad contempt powers.
If the safe harbor law protection doesn't apply, and the defendant is responsible for the illegal behavior, the defendant can absolutely be held legally liable and pay the legally-appropriate punishment.