"A coup d' etat does not need a positive creed, just an enemy.Why of course! Like Duh!!!
A Civil war, on the other hand, demands a cause, a banner and some form of manifesto.
During the preparations for the coup, the military plotters had not concerned themselves greatly over the exact form of government which their prronuncciamiento would herald."
- The Battle For Spain: The Spanish Civil War 1936-1939
c. 2006 ISBN: 0 14 30.3765 X
Republicans vote because it is a civic duty and a part of the social contract that maintains the rights of the governed to be governed solely by their own consent, and not by any insane ideas of Divine Mandate!!!