I'm a libertarian who supported neither Trump nor Hillary, but the left's hysteria over Trump's win has been something to behold. I'm sure he'll be a disastrous president in many ways, but the thing that animates the Left's animus towards Trump is that he is someone who represents an existential threat to their sacred institutions (the media, entertainment, academia) and signals that they are becoming less and less relevant.
Make no mistake, most of the Left's opinion-molders don't actually think Donald will deport ALL undocumented workers, round up gays and Jews and whoever else and throw them into camps. This is all orchestrated hysteria.
In this particular instance, we see a very common tactic employed selectively by the Left. If a right-wing politician who is not sufficiently controlled by the establishment starts to gain political power, they associate him with the worst of his supporters and sanctimoniously demand that he "denounce" the degenerate supporters. Every time CNN or some other outlet speaks about David Duke's praise of Donald Trump, it encourages the viewer to consciously or subconsciously associate Trump and conservatives with overt racism, with the KKK and with Nazism.
It never works the other way though. During the Primary season, the Communist Party USA chairman John Bachtell endorsed Hillary Clinton. He, and other self-described Communist Party chairmen and members also endorsed Barack Obama in 2008 and 2012. Shouldn't Obama and Hillary they be hounded to repudiate these endorsements if we are adhering to the same standard?
Communism has produced profound misery in the world. Estimates have been made that Communism caused the deaths of between 60 Million and as many as 100 Million people during the 20th Century. I'm not at all claiming that Hillary and Barack ARE communists, but more than a few devout adherents see them as fellow travelers who will advance their agenda in some capacity.
The vile organization known as the Ku Klux Klan, and the odious ideology of White Nationalism has caused comparably less deaths, especially in modern times. In contemporary America, the numbers of actual adherents to either the Klan or some form of white nationalist ideology are extremely small in number. They are social pariahs in almost every community.
I don't care which candidate you pick, you can easily find some disreputable person or organization that supports them. In point of fact, though, the KKK and White Nationalism serves more as a convenient bogey man than as a real threat to ordinary people in this day and age.
Although my initiate caveat should serve as sufficient, I want to reiterate that I don't support Donald Trump or nearly any of his policy proposals (the few that are actually coherent). I am a libertarian who supported Ron Paul in the GOP Primaries in 2008 and 2012. I voted for Ralph Nader in 2008, Gary Johnson in 2012 and Jill Stein in 2016. I voted for Nader and Stein for their strong anti-war positions and because there weren't any decent libertarians running in those election cycles.