It's pretty easy: there's no culpability on either side. It's not either-or. If guns and ammo and knife manufacturers are not responsible for murder than neither are ISPs and software developers responsible for piracy.
If the courts don't like that an IP isn't a person, then they can pressure congress to change the laws. Until then, everyone can go fuck off
I would argue by virtue of their constant bribery.. I mean lobbying.. that each of their votes is more like 2 million votes as far as getting policy changes enacted...