Historian: A democracy's citizens must know some history if the democracy is to meet its challenges.
Conclusion
Popular historical awareness is inevitably distorted.
Evidence (for)
Most people learn history through popular narratives, and those narratives sustain interest by implying that a few famous heroes and notorious villains have shaped all of history.
Evaluate
The author is arguing that most people have a distorted sense of history because most of us learn history through stories that imply that a few famous heroes / villains have shaped all of history.
The author is insinuating that this is NOT an accurate sense of history. It's either wrong in what's saying or misleading in terms of what it's omitting.
Goal
As a Missing Link answer, it would sound something like, .
But the answer might just supply the Missing Idea that,
We might even see a Defender answer like,