ORIGINAL: Jimmbbo
In the tail dragger, the CG is moving to yaw the airplane further around the mains (relatively unstable), while in the tricycle gear, the CG is trying to move ahead of the mains (a stable situation).
This didn't occur to me, but it makes sense. This is similar to the reason the new VW Bug has the engine in the front. Old Bugs and Corvairs had a tendency to try to go backwards due to the aft CG.