The reason Windows people think they're just as safe is because they're the victim of a propaganda war about the existence of Security By Design. Microsoft tries to play both sides of Security By Design, and most people don't even notice.
<p><a href="http://securityawareness.blogspot.com/2005/05/mad-as-hell-metaphor-142.html#comments">Thus starts</a> a really good article that does a fantastic job explaining the diffrences between Mac and Windows. Go, Read it!</p>