hahaha this thread is HILARIOUS!!
Limewire and other P2P programs arent hosting the music. They are simply connecting users to each other. If the users choose to share copyrighted (illegal...) music, that's there problem not the P2P network.
The orignal Napster used a centralized server to connect people with others. This is why they were shut down, because there was an origin. The recent P2P networks have no centralized server that is in charge of connecting people. Everyone connects to each other and there is no centralized server, hence nothing to shut down. So, the RIAA resorts to corrupting files in the network and trying to make it harder for users to download the software. But, there isnt really anything they can do since the software itself isnt illegal.