Answer:
central idea
Explanation:
A central idea of a passage is the main point that the passage is revolving around. The central idea is the building block and starting point for all other small ideas. The central idea is your main selling point and is the reason the passage was written.
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It depicts the collective society as a destructive force that represses the independent thinker.
Looking at the excerpt, you can see that even with the warnings they did not heed because of the few who did so. They went with the majority even if they were wrong. These independent thinkers, perished along with them as a result.