Does it actually do that? I haven't heard of it... But just reinstalling the OS accomplishes the same, slightly less quickly. Of course, if the malware is nasty enough, it might modify user settings to make a program run automatically, e.g., by adding it as a startup item, which, unless that OS reinstall included a patch, could then exploit the bug again and reinstall itself to the system locations. Not much Apple can do about that.
