I always liked the idea of good vs. evil when it came to dragons in particular. I always assumed dragons were immortal, spawned upon the creation of the universe, and embodying the primal conflict between evil and good which was part and parcel of my vision of a D&D universe. I also like the idea of dragons "turning" to another alignment for one reason or another - a red dragon "converted" to good by powerful celestial forces, a gold dragon whose zeal for good twists into evil itself, etc. Good plot hooks, in other words. Anyway, if I recall correctly, weren't copper dragons always described as being a touch on the neutral and selfish side since as far back as the 1e MM?