And summoning up the specters of fascism isn't a scare tactic. It's what happened last year in Charlottesville. White supremacists of all types had a big march. Even killed a counter-protester. Maybe you saw it? We even had a neofascist group do a march here in my local city. And right now, there's flyers espousing the "goodness" of fascism.
You can argue all you want from people from 300 years ago. I know if these people get say-so in government, I and my friends will lose rights, become disenfranchised, and possibly murdered. They say precisely that. So yeah, I do have a rather strong claim to not want fascists to take hold.
I do not believe this to be true and representative democracy managed to survive the larger half of a century with opposition from fascism, socialism, communism, autocracy, modern dictatorship and Orwellian totalitarianism. I think this trend will continue but it seems that you do not.
Keep in mind that a full third of the English language comes from German. In the 20s & early 30s, one of the largest and most financially/socially successful groups of immigrants in the US & UK were German. Germany and Fascism were politically very popular here and openly supported until (and on the US side, part-way through) WWII. Even under those circumstances, it was politically untenable. This is even more true now.
"The concept of popular sovereignty holds simply that in a society organized for political action, the will of the people as a whole is the only right standard of political action"[1]
[1]:https://books.google.com/books/about/The_Massachusetts_Const...