I hope that none of my fellow Mac users get or remain confident about our (to date) avoidance of these problems. Yes, Macs are more resistant BUT all it takes is someone persistent enough to find a vulnerability. I do FREQUENT external drive backups using Newer Technology Voyager SATA drive and rotating 3 HDs. Still, I have a fear that some morning I will wake the Mac and see a message such as this. Yes, I follow the sanitation rules but still you never can be 100%. What a world, the more capable we are, the worse we can be hurt!
That jumped out to me also.
As mreerm pointed out and I listed above, there are many paths through Open Office, various Media files, and .pdf-types to have others be so complacent and dismissive of the potential for future damage.