And while we're talking of vigilante justice....
This law, it seems to me, is tantamount to a law allowing robbed houseowners too smash the burglar's car (is they could find it). Now in a civilised society, not even the police is allowed too smash the burglar's car.
When downloading mp3s the computer and the P2P network is a vehicle, nor a company nor the police can destroy your property, and if a company would try, one would (in most countries) have a right too self defense..
Now the this could be interesting..
Script kiddies and corporate hackers fighting DoS wars