[jcranmer]

The other factor is that the vast majority of Windows security administrators (i.e., random users) are incompetent.

In terms of the security of the operating system itself, Windows may well be more secure than Linux. Many Windows applications, however, are going to be much less secure than the OS--although it's not like Linux applications are stellar in this regard as well (e.g., Docker).

[falcolas]

Are they incompetent, or is the bar set so high that only trained professionals can be considered competent?

I believe the latter is true; I've seen some incredibly intelligent individuals fall victim to shady crap.

We (as in the entire software development community) need to lower that bar.

[ryanlol]

Vast majority of Linux admins are incompetent.

>Windows may well be more secure than Linux

This is very obviously the case if you look into the deployed exploit mitigation technologies.