The terror was fully part of the revolution, and was notably when the vote for France to proclame itself a Republic happened. It was heavily influenced by the fear of retribution for whom may vote against. France would still be a monarchy if not for it.

FWIW, France became an empire, then was restored as a monarchy, then back an empire and monarchy before it became a republic durably. Revolution was not a series of peasants and commoner ridding themselves of their despots, it was much more dirtier, political and complex than that.