Why might democratic nations be fearful of authoritarian or fascist leader

Mostly so the people can still have power.

Explanation:

Authoritarian and Fascist leaders are usually dictators, with absolute power, denying people's human rights to create stability in their nations. A democratic nation with good human standards would have people who'd like to keep their rights. Only in vulnerable or unstable nations can real takeovers occur (sometimes, stable nations have problems).

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