Everyone has dragons in their history. We are ubiquitous in the minds of men. Every culture has a dragon mythology. Even cultures which would be far too cold to support reptiles of our size and climate needs have memories of dragons.
Only in modern times have things become ridiculously obscured (when they were simple to untangle if you could live a thousand years).
Dinosaur is just another name for dragon. Let us face it–it is an epithet. We, ancient race of monarchs, reduced to brute beasts? Mindless and dull…
Leave it to humans to think they can figure things out to a point of control only to find they have lost the heart of the story. And without the heart, the rest becomes a silly fiction.