The great constitutionalists, from Aristotle to Montesquieu to Madison, believed that the populace should have a voice, but they also thought, with Cicero, that the well-being of the people was the highest law. Survival and flourishing is most important, not pandering to popular passions.
Any small “r” republican knows that a good society divides up power among authorities, repositories, and mysteries, such that all are checked and balanced; neither the bounder nor the mobile vulgus can become tyrannical. Pluralist theory seeks both safety and stability in multiplicity. The wisdom of crowds—and brokering institutions.
I don’t think that’s something that we (general we) are failing to do. Conservatives aren’t getting called fascists for their opinions on gun control or privatization. They get called fascists for taking away peoples rights, for their open calls to end democracy, for their defense of neo nazis, etc.
Not all Germans who voted for Hitler were actively trying for the extermination of jews. It’s not an issue of what they are actively trying for or want (at least for a large chunk of them).
This issue is that they are ok with supporting politicians who are actively trying for or want extermination.