Generally, open discussion of a false and pernicious idea diminishes its appeal.
Task
The uncommon stem makes this question hard to categorize. "Which of the following principles" is common phrasing for both Principle Strengthen and Principle Conform, but "most clearly illustrated by the statements above" is more typical of Proposition / Generalization questions, a subtype of Most Supported. The task for that subtype is to extract a proposition / generalization / principle from the reading, which often feels like articulating the "moral of the story." That will be the task for this question.
Given
Generally, open discussion of bad and dangerous ideas makes them less appealing. However, even in democracies, certain bad ideas are so attractive that they get more appealing when they are discussed openly.
Evaluate
Proposition / Generalization questions often revolve around an important pivot word that creates tension in the stimulus. Our job is to find an answer that does the best job articulating that tension. Our first claim is something that is generally true: open discussion lessens the appeal of wrong ideas. After the pivot (however), we get tension in the form of an exception: some bad ideas are so appealing they get more attractive when debated.
Goal
Look for an answer that articulates that tension. Beware strong language, new ideas, and unsupported relationships. Lean towards the weakest, most provable answer.