Did you know that there were vulnerabilities in Mac OS X where by someone could actually get root access to you system? After 6 months or more of complaining, Apple finally decided to address some of these issues. The Apple folks may know hardware, but are way behind the curve on UNIX. If you really want UNIX, go with a vendor that specializes in it.
Source please. I'm not aware of any remote root exploits for Mac OS X, and certainly not one that was known and unpatched for 6 months.
Yeah, provided you could get your hands on the actual machine in question. ANY security expert would tell you that if you allow an unauthorized person to have physical access to your machine, you are by definition nonsecure.