Since the so called righteous authorities likes to go around tearing down what they considered as bad... I think drastic measures of defense is needed to defend.
TorrentSpy have been demolished because of a cour order from MPAA.
What Bit Torrent could have done is to add a technology that would allow clients to become mini trackers too. So if the supposed 'Justice people' wants to take the trackers down, they have to kill off all the clients ... which mean no BT.
Humans have really corrupted and made the world a bad place to live.