rgbrock1 -
The aero loads during a spin are not destructive; a spin starts with the aircraft in a stalled (low-speed) condition, and even in a flat spin the aircraft should be expected to hold together. The rate of descent is of course high, and in an intentional spin a pilot will be planning his recovery (or escape) at a generous altitude.
In an airliner-size aircraft, though, the long fuselage means that things near the front or the aft of the ship are subjected to a lot of centrifugal force, perhaps enough to be incapacitating. (Think tilt-a-whirl at the carnival.)