Just because something is illegal, does not make it wrong. People generally ignore unjust laws, if they can (see: The War on Some Drugs), and these silly copyright laws are unjust.

Besides the moral justifications, it isn't possible to shut down Napster. Even if they shut down the commercial server, there are lots of independant ones around.
DMan, by your logic, it would be wrong for someone with a photographic memory to read a book. Copying isn't stealing.
bigmouth_strikes, are you insane? Are you aware of the fact that the Nazi party was democratically elected? No system of government is perfect, and neither are the laws they pass.