Actually I'd argue that Linux is a magic bullet that stops ... most malware. The problem I see with OSX and Windows is they don't have a unified package manage

Actually I'd argue that Linux is a magic bullet that stops ... most malware. The problem I see with OSX and Windows is they don't have a unified package manager, which encourages users to go find it, often from a random website. Being commercially driven Apple and Microsoft have much weaker open source communities. Why would someone write a screen saver for Apple or Windows? Why would they give it away free? Why would they pay apple for the privileged of writing an OSX program and hosting it on their app store? Take a security naive user, sit them in front of a Linux box, and they are likely to meet most of their needs with apt/yum/dnf install <foo> or using any of numerous GUIs to do the same. There's MUCH less of the install random package or shudder browser plugin from a random site in the linux world. Similarly it seems that generally Chrome OS is more secure than windows or OSX, mostly because even though you can install apps, they have a more limited sandbox.