The Columbia Journalism Review has an opinion piece on media company's attitudes towards ad blockers:
What media companies don’t want you to know about ad blockers [cjr.org]
As the author points out, the media companies want the ability to force users to turn off ad blockers, but also do not want to be liable for any malware and/or NSA spying that they serve up from their ad networks. This seems more than a tad unfair to users.