Four years and were still waiting to see the first OSX Mac virus... the one you say you could easily write...
Any computer user who thinks he's invulnerable is a drooling idiot. However, many can rest assured that their platform is relatively more secure than many others on the market.
Everyone uses weasel words when discussing this stuff because anyone with a brain knows that no software is perfect.
And, as I said before, an actual working virus would be even more effective.
In the past year there has been a demonstrated attack against a hardware firewall product that had just 50k potential victims on the internet, yet it took less than 24 hours to compromise the entire vulnerable and exposed population.
Surely even Macs are a bigger population than that. If these systems were as easy to compromise as these anti-virus shills claim, we'd see something.