The reason Windows gets attacked so much to begin with is because of its market share, not necessarily how vulnerable it is. If you want to cast as wide a net as possible while wasting as little effort as possible, why the fuck would you target the lesser used OSes? In the same vein, why would you invest so much in protecting OSes that aren’t as big of targets as Windows? Your comment sounds as ill informed as those people that think Macs can’t get viruses.

Even medieval peasants bought their bread from bakeries most of the time.