To be precise, it is not merely humans and dragons; this is the fundamental nature of all living things, and the inherent flaw of all creatures is... greed.
Lions and tigers fight for wider territories, humans strive for higher social statuses, and dragons go without saying—any creatures appearing in myths are symbols of hoarding and greed... Even beings as noble as the Four Great Monarchs are no exception.
The most fundamental behaviors of living creatures are driven by the desire of greed. For the legacy left behind by the White Emperor, creatures at the level of Dragon Kings do not hesitate to collude with humans—this is simply the ultimate disgrace to the Dragon Race.
Chapter 699