I thoroughly disagree with this. Corporations often wage "ideological" "wars". That's what lobbying is all about -- a corporation has decided Public Policy X will either help or harm their corporate interests, so they pay lobbyists to advocate for or against it.
Media companies like Universal, Disney, et al guard copyright very closely. They want to advocate the belief that intellectual property is identical to physical property and that the only rights anyone has to an idea are the rights that the idea's copyright owner decides they should have (usually granted when the petitioners include a large check with their request for rights).
Copyright is the most vital issue to media companies and they treat it as such. If they find what they believe to be gross infringement, they are not kind to its purveyors -- I think we've had enough history in filesharing to know that.
Grooveshark is just another way to skin the cat. Its extensive (and some would say "egregious") use of DMCA safe harbor provisions I think probably is one of the major inspirations for SOPA and PROTECT-IP. Cases against Kazaa, Grokster, and others did not come attached with new legislation because they didn't really have a plausible case under the DMCA. Grooveshark's service-oriented approach makes them a clear safe harbor, and unless Grooveshark quickly sees legitimization as a marketing channel and gets "white-knighted" a la YouTube and Google, they will remain rogue and the media companies will keep hounding until they get at the jugular. Since Grooveshark is using DMCA as a cover, the media companies just want complete control over "the internet" (i.e., the internet as most people know it, DNS) so they can send the Federal Bureau of Cybercrime Protection a notice and have Grooveshark or other services with a plausible legal defense blacklisted just like that -- no need for pesky "trials" when records companies are losing hypothetical money!
It should be common knowledge by now that old media will keep at this game until it ruins them. They are absolutely committed to it, and they will fight to death -- either theirs or ours -- to get copyright the way they want it, so that they can gain more cash from the so-called "lost sales" perpetrated by anyone listening to major label music or watching major studio movies but not buying at retail or iTunes.