The US federal system of elections is not democratic, and even if it were, democracy is necessary for, but not sufficient to, a government which is in accord with the rights of the people. Popular tyranny remains tyranny, and its victims are no less justified in resisting.
Now, you can argue that the outcome these people fear would not actually be a tyranny, but that's a different argument than that your apparent argument that not submitting to a democratic output irrespective of its content is equivalent to fascism.