[tptacek]

So far as I can tell, there are two kinds of (effectively) single-user systems, in which a malware infection is targeting a single person:

1. The kind where users are rarely asked to assume admin privileges and all the data a user has to protect is available without administrator access.

2. The kind where users are frequently asked to assume admin privileges and some of the data a user has to protect requires administrator access.

I don't believe Linux has any real edge here. I agree that 95% of the effect is due to Linux's paltry desktop user base; I'd guess than at least 4% is due simply to malware that targets Linux not being called "a virus".