There are cults in IT. UNIX is one; Macs is another. These cultists fervently believe their OS is superior to others, and, by extension, they're superior to everyone else.
When it comes to vulnerability to attacks, though, UNIX was always an easy target. Macs are so safe and secure. Of course, until recently there weren't many of them, and they weren't in the enterprise, and so they were not as attractive a target as, say, Windows. Now that there are more Macs, making them an attactive target, the myth is staring to explode. Still, zealots being zealots, all's right in their world. Koolaid anyone?