Exactly, DCF. There's an old adage that says, "A locked door will stop 99% of thieves." Cars have been stolen from well-secured garages on the owners' property; there is no way you're going to stop a determined pro. Even the pro, however, is still a thief--meaning he doesn't want to work for anything in the first place, so he steals instead. The lower the effort, the more-likely the target. Make your car a harder target, in a high-visibility way. Short of Grant's removable steering-wheel security deal, The Club is the most visible way to do it, and you don't have to spend the time storing the wheel like with the Grant setup. It all comes down to time and effort.
The best defense is a good offense. Yes, they can clip the steering wheel and bend it open to get The Club off the car. 99% of thieves are not going to bother, period, unless you own a particularly rare or high-dollar car and they've got a quick way to part it out or sell it to someone far away. If that's the case, believe me, they're coming with a lot more than bolt cutters. Also, if they want the car undamaged on the rollback, they'd have to dolly both sets of wheels if the fronts are at full lock to avoid breaking the tranny, axle, or brakes at the very least (I don't know of anyone that leaves their cars in neutral without the park brake applied). That's even more time at the scene. As I mentioned, I'm sure that Hemi 'Cuda is somewhere overseas, as to my knowledge it was never recovered. I doubt the thieves were ever inside the car until after it was a good distance away from that parking lot, and well concealed.
When I lived in Atlanta, a friend's flawless 1986 4-4-2 was stolen right out of the high-profile "Musclecar Parking Only" section of the parking lot, maybe 60' from the showroom in the middle of the day. It was locked with no keys in it. No one from YO saw anything, any customers that saw the car leaving just thought the owner was going to lunch. At that time, mid-'80s RWD Cutlass models were one of the most-stolen cars in the country, partially because they're enormously easy to steal. I'm not a professional, but I bet I could steal a mid-'80s G-body in less than a minute... I know for a fact I can slim-jim my way into one in less than 30 seconds with a freakin' coat hanger. I believe that had that thief seen The Club in that car and the wheels cranked, someone else's car would've been gone. It just would have taken too much time. Jimmy agrees with me on that. There was no rollback. I'm sure the thief planned it, but you don't walk into a busy parking lot in broad daylight in midsummer Atlanta wearing the trenchcoat you'd need to conceal a pair of bolt cutters, which are far larger than the tiny tools needed to pop or pick a Saginaw lock cylinder. You'd stand out like a white lint ball on a black sweater, and someone would mention it--particularly at a place like Year One, where every employee knew Jim's car and every customer is a gearhead. The only thing ever recovered of the car was the cowl, firewall, toeboard and half the A-pillars... in FL, over a year later.