Board Thread:Lore Discussion/@comment-15888551-20130823092654/@comment-40.132.217.182-20140411094615

So, it's evil to destroy a race that is instinctivily hostile to all mortals? As far as we know, every dragon supported Alduin and his tyranny over men and mer until he dared to declare himself an equal to the gods. They didn't have a sudden change of heart about how they treated mortals nor was it motivated by some sense of compassion or pity for their plight. It was their own outrage that Alduin dared declare himself a god and the intervention of Kyne that turned them against him.

Paarthurnax even admits that he is constantly tempted by his draconic nature to give into the instinct to dominate, and tells us that we should never trust a dragon. So, the Blades and their predecessors were entirely justified in wiping out the dragons. If they hadn't, it's likely that they would have eventually reorganized under another and attempted to enslave mortals once again. The dragons are not some innocent, misunderstood creatures. They are apex predators, and mortals are their prey.