I really don't get it! It's mainly these arrogant expressions against users of different OS. Just to point out: Having configured Windows correctly, it will be as secure as Linux and as Mac. And in my opinion, it even more secure in most cases, because it's simpler to adapt than Linux for instance. Do you all get paid by Apple? And how can join? Please contact me and I'll give you my bank account number.
I am developing software, and I can tell you how easy it is to corrupt a system. A virus doesn't need to destroy the system folder. Isn't it enough when it simply deletes all pictures in your home directory? And who of you all uses a different account for mail, pictures and browsing. Guess there aren't many.
So for all of those who still uses a bit of brain even when using a mac, go on page two, have a short glance at my post there, and take 15 minutes to tidy up your mac. Hopefully you will never get into a situation that causes damage to your system, but if you do, you'd be glad having followed some security advice.