If everything was secure we wouldn't need guards.. and even if we have guards there are many case as to where they fail dramatically..
I used the words as the virii writers have to make a choice as to the target before starting the work.
Chris even in the mid/late's people were screaming that Mac's were safe when a whole bunch of virii came out for windows 3.11. It still didn't stop as I've said before a few of duobooks getting a malicious virii which meant a re-install where I worked support 3rd party companies. (a couple each month out of about 300 users)
Nothing is truly secure especially when the criminal fraterity (and that's were a good proportion of the virii now come from) turn their attention towards a product