I have been using Macs longer than most people. It is not that Mac users think that their computers are immune from viruses or spyware, etc... it is the fact that the OS is designed in such a way that none can be interacted into the system unless you have the administrator password.
Unlike windows in where you are pretty much given the ability to turn off the administration warning, because it acts like the boy who cried wolf ad nauseum, and people ignore it.
Apple's Administrator warnings come up when the app comes up and says, hey... this is trying to access something, or install something that needs administrator rights to do so.
Which means that whatever you install is your own fault, the same goes for web sites you go to. Any idiot can go to a website, an informed person (an administrator) can make sure that your computer is safe on the network.
As for your home computer, that is where the greatest threat is... it is probably time for Apple to start introducing iFirewall an app and/or hardware that's sole purpose is a firewall, or put an update into the Airport Extreme to work as a true hardware firewall, instead of what it is.
Apple has a chance to get ahead of hackers, instead they are doing what IBM and MS did... having the wait and see approach. The only way you are going to protect your mac is by knowing what is going on yourself.
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