Viruses don't have major bugs. Viruses don't have three different sets of documentation that is all mixed up and wrong. Viruses arn't on every computer. Viruses don't have stupid wizards. Viruses when installing themselves don't try to send private info about your computer over the phone lines to microstoned-net.
Viruses install themselves.
Viruses don't try to push out all compitition. They just try to do their job. Viruses don't try to copy what Apple does. There are programs you can buy, or get free to remove viruses.