Mac viruses now a foot????

I read an interesting article in today's Information Week daily update.  It claims that the recent attacks on the MAC framework mean that the glory days of these computers not getting attacked or the software being unhackable are over.  I know many hackers have probably tried unsuccessfully to attack MAC, but this may be where the world changes and they actually have to secure their computers.  When I bought my first MAC when I got back from Iraq this time I was told that I did not need a virus scanner on board because MAC's never get attacked.  I knew that this was too good to be true so I was able to download MacAffee for free through the army.  I do the normal updates and virus scans and have not had any problems as of yet.  I just wonder where these people would get a crazy idea like their MAC can't get a virus so you don't need any virus scanning software.  That is just crazy to me.