I've not had a single virus when I had Windows 7 for a few years, and the same with Windows 8. Does that mean Windows doesn't get viruses?I wouldn't say ignorant, I would say fact. I'v not had a single virus on either my MacBook Pro or iMac.
Maybe in the future as more people buy Macs then viruses may increase, but for now I would say I'm pretty safe.
Also how do you know you don't have malware? Flashback silently installs to your system so you never know.