Macs are vulnerable to malware just like other devices.
Let me know what you'd like rewritten! I'm ready to adjust it for you.
They differ from Unix. In my view, Linux handles things more effectively because it keeps the user in control of what happens.
Macs are vulnerable to malware too. Don't underestimate them.
How to fix Macs http://theoatmeal.com/blog/fix_computer
Tell them to reconsider when asked for an administrator password and everything will be okay.