Because Mac has so few users, that there are few hackers willing to waste their time bothering with it.
"Because Mac has so few users, that there are few hackers willing to waste their time bothering with it."
Total garbage. Mac OS X is UNIX. Its more secure, and thus more difficult for malicious coders to infect. Windows is junk and its security is a joke. Thats why its easy to infect. OS X is inherently superior. Its high security has nothing to do with how many people use it.
Rubbish. There are at least 25 million Mac users worldwide. The last Mac virus I saw happened about 15 years ago, and there are no Mac viruses in circulation now.
Mac OS X is designed to be a secure operating system, so we don't have to waste our time dealing with worms, viruses and spyware infections like Windows users do.