"Your governments were right. My ancestors fought from dragon-back, before they all died out."

The dragons, she means, but...the ancestors, too.

"We must be responsible for each other," Dany says, facing forward now, reflecting on their situation with a more somber air. "If we are all in this situation as one, then it is our duty to protect and to teach. To divide our numbers and to keep secrets is foolish."

If they aren't make sure that everyone is able to protect themselves from the near-constant threats of this world, then they'll all suffer for it.