ISP Seen Breaking Internet Protocol

Internet service provider Cox Communications is reportedly diverting attempts to reach certain online chat channels and redirecting them to a server that attempts to remove spyware from the computer.
Specifically, Cox's DNS server is responding to a domain name request for an Internet Relay Chat server. Instead of responding with the correct IP address for the server, Cox sends the IP address of its own IRC server (70.168.70.4). That server then sends commands to the computer that attempt to remove malware.
Though clever, the tactic is being heavily debated by networking experts on the NANOG mailing list, some of whom question the effectiveness of the technique and who question whether blocking access to the channels for all users (by breaking the DNS protocol) in order to stop some malware is the appropriate solution.