I've worked in IT for the past 20 years and I've heard the repeated claims from Mac owners that viruses can't touch them. I also agree that Mac owners are a victim of Apples own success. There's now more and more people following the crowd and buying these shiny machines (style over content) and thinking they're safe. Because the ownership of Macs has increased, it has become a lot more viable for the script kiddies to work out exploits in the OS and take advantage.
You are NOT safe as an Apple owner, end of story.
It's now a sad fact of life that the internet really isn't a safe place to be, and that's a shame because there's so much useful information out there that could really help everyone in the world. Unfortunately there's also those out there looking for easy ways to make money, and malware/viruses are only the tip of the iceberg.
Slightly off topic, but I'm getting a lot of non-delivery reports for some nasty emails I've never sent out (around 40-50 every single day). Somebody's spoofing my email address and there's absolutely nothing I can do about it. Luckily it's not getting me blacklisted at the moment (I've got all the SPF records etc. set up correctly), but because some people do silly things like run without any sort of protection (and yes, these emails ARE originating from Apple OS), I'm completely unable to do anything about it.
Did you know there's something like 183 BILLION spam emails sent every day?! That's 70% of email traffic, a lot of it originating from spoofed email addresses such as I'm getting at the moment.