Rumors, superstitions, or propaganda can replace reason with irrational hysteria when groups of people get together.
Agree, Disagree, or Unsure

Explanation:

Yes, rumors, superstitions, or propaganda can replace reason with irrational hysteria  when groups of people get together because reason gets undermined when a particular rumor, superstition or propaganda is believed by the majority.

This can be seen in many past as well present instances where baseless claims or propaganda have swept people in great confusion and misunderstanding.

When groups of people start to believe in a particular rumor, superstition or propaganda, the society as a whole eventually start to accept them as facts. Also commonly known as mass hysteria, the general masses fail to reason with facts and create a hostile environment around them.

One of the many examples would be the Soviet propaganda in U.S during the Cold War ear which have caused mass hysteria among the citizens of the country.

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