"He challenged himself to describe in equations the wobbling movement of a spinning plate being tossed in the air by a student in a Cornell cafeteria. After much effort, he was able to show that, consistent with his observations, for a small degree of wobble, a one-to-two ratio between the wobble and spin was indeed valid. When Feynman excitedly described his results to Bethe, the other scientist listened with interest but wanted to know their practical value. [...] Ironically, he found that the spinning-plate movement he had studied just for fun also had application to the electron-spin problem."

It's about creating an accurate model of the world and universe. I never saw the point of being caustic against any kind of research.