Judging people on how they vote would be the end of Democracy wherever that happens

 Democracy isn't perfect but all other governments are worse. 

If you look at Democracy as a bloodless war this might be useful. So, judging people on how they vote turns the government into a bloody war. So, not judging people by how they vote is how democracies survive.

What Trump is doing is Fascist where you call anyone with another point of view "Vermin" and saying they need to be eliminated by putting them in jail or killing them.

This point of view is the end of the democracy present and the beginning of a bloody civil war between people of different points of view.

So, once you start judging people and wanting to kill them or imprison them for a different point of view then democracy dies.

Very Simple.

Democracy dies in a regime like Trump is talking about. IT would be the end of our government since 1776.