This is the answer I gave then, approximated:
"It could be said, perhaps, that dragons are the most natural thing, older than most creatures you know, father of both fauna and fiend, mother to miracles and calamities. You've even heard rumors among the stone prisons they make for their tiny scared gods that dragons smoked the world into being. Yet is nature itself often the enemy of nature. With flood and famine, there is balance, and destruction brings life. This is not always so. A plant out of its home, wreaking destruction on the plants and animals around it, may be called a weed, and chokes the forest, flower and garden. A creature out of space consuming, reproducing, driving others to extinction, may be called a pest. These things have no malice to them, no forethought: they act according to their kind, and so may nature become an enemy of nature. An element from the earth may poison the stream which flows over it and all downhill beyond.
"A dragon, though, has forethought, and all you know of the world around you speaks to its malice. This rancor is directed at the whole of creation, at everything which is not dragon, and specifically not self. What's your Wisdom? See then the laze and caprice with which it destroys. And remember that this is the beast's nature."
As an aside I find the official rigor and restriction associated with the panoply of D&D dragons, or for that matter the plethora of D&D dragons, tiring and boring. But then I wasn't at liberty to embellish.