When playing a strategy game like Civilization 4 you learn quite rapidly that when you attack but don’t succeed in killing your enemy, the enemy gains experience and is harder to kill in the future.
The same is true of bacteria. If you have an infection, you attack it with antibiotics. If you don’t kill all of the bacteria you end up with antibiotic-resistant bacteria, which are quite troublesome.
It is no surprise that these lessons are lost on the MPAA. They attacked The Pirate Bay but didn’t kill it. Now, all manner of people who didn’t know about TPB beforehand know about it now. Not only are they not dead, they’re stronger. BitTorrent networks are better when they are bigger.
Which, if you ask me, is fine.