If by the other day you mean nearly 3 years ago...
You can keep making excuses for why so many macs were infected but at the end of the day, that's what they are, excuses. Complacency is no excuse unfortunatly.
But yeah, I see where this is going already. Me telling you how it is and you just hunting for excuses and blindly defending a brand. Not surprising though.
You are talking about one Trojan on the Mac vs thousands that infect Windows PCs everyday, with or without antivirus installed.
I'm not being complacent in any way, I'm just stating facts. You probably heard about Flashback in the news and now you loudmouth about it. The media made a huge deal out of it. I have yet to meet a Mac user who got infected with it; and I know several.
Now you tell me you haven't met a Windows user who has never got a virus or Trojan on their Pc and I'll shut up; just try to be honest about it.