Going after Kazaa is rediculous.
It's licence agreement frees them from blame if someone abuses their service.
MP3s are generally a good thing as it's an easy way to discover new music.
If I find some music that I like then I'll generally buy it. Nine times of ten, MP3s sounds like ####!
If I don't like it, well then I delete the file.
I got better use for my hard drive space than bad MP3s... :-)