The fact that any application can spoof the os password prompt makes me wonder why they don't have a prominent feature to show the prompt is from the OS. On windows there is the secure desktop with the dimming effect.
replies(6):
Almost all of the viruses reported for Macs were in fact Trojans.
And even if there were a few legitimate viruses over the years, none went very far as to cause much trouble to any sizeable number of people. Contrast with the barrage of Windows viruses and widespread mayhem they cause, on a platform were almost everybody uses an antivirus too.
It's not "just" due to the Mac being less popular either. Mac OS up to 9 got lots of viruses back in the day, and Macs had just 1 to 2% market share in the US. Nowadays they have several times that.
So yeah, on my Mac and Linux boxes, I'll care about viruses to the point of running an antivirus or such when people actually start getting some...