It took them long enough. This gives reason for Mac users to install an AntiVirus & Internet Security Suites just like the rest of us (same goes for you Linux users). In the information age, nobody is immune to malware/ID Theft. Now it's only a matter of time until hackers deviate their efforts away from Windows (somewhat) and move onto Android, iOS, and possibly even Linux.
The trouble with Linux is the "you do not need antivirus software" is taken so far that it does not really exist for the most part and what is there is meant for servers (so they do not pass on files containing viruses).
I do use an antivirus in Linux, though the one I have was (as mentioned) mostly for servers (clamav, with ClamTk for a GUI front end. It is specifically for email servers). At least it should help keep stuff out of the partition that is shared with the Windows 7 install.
I really hope the IT department at the college I go to starts requiring AV software for systems other than Windows someday soon to be allowed on the network.
And the bad guys are crackers, not hackers.