According to Wikipedia, only single-engine aircraft with an MTOW no greater than 12500 pounds are required to demonstrate the ability to recover from a spin, and not large or multi-engine aircraft. This seems backwards to me, as it would seem to be far more critical for an airliner with potentially hundreds of people on board to be able to successfully escape from a spin than it would be for a small GA aircraft where only the pilot's life is at stake, and not anyone else's.
Can someone explain this seeming contradiction?