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Isn't Mac OS much less voulnerable because of how it was written? Doesn't have all theese security holes and voulnerabilities that MS-Cheapware has?

Exactly. A UNIX core is, by nature, untrusting of anything. There is a distinct and very tough to penetrate wall of separation between user memory and kernel memory. There are hard separations between user-launched apps and root-level apps. Files have always had hard permissions (to be fair, Windows added this when the NTFS file system came about, but not until Vista was there a hard default enforcement of them).

It isn't impossible to break into a Mac or Linux box and control it, but if you're a hacker, you'd better bring your 'A' game to do it. Script Kiddies need not apply.

/P