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Erik, please go read this post by Deb Shinder:
http://www.techrepublic.com/blog/security/black-hat-2011-update-macs-in-the-crosshairs-kaminsky-on-bitcoin/6222

a quote from her coverage of BlackHat 2011:
"The talk compared Mac OS X to Windows and concluded that the default settings in OS X can allow easier hacking, and it???s time for businesses that use Macs to get just as serious about security on those systems as they are with their Windows machines."

Also, the features you describe in your section "The Facts" are all features that exist in Windows 7 and 2008R2.