> It's currently in-vogue to be scared of and hate nazi's. For some reason though that sentiment never took root against communists.
It did, there was plenty of paranoia and hatred of communists during the Cold War days, we just never fought an actual war against communists (edit: except in Vietnam and Korea, I forgot that for some reason...) Of course, a lot of that Red Scare stuff was just a thin coat of patriotic paint over anti-semitism and anti-gay bigotry, but I digress.
Also, it's not in-vogue to hate Nazis. Everyone other than Nazis has hated Nazis consistently ever since Nazis were a thing.
What is in-vogue, however, is to be a nazi (little n, colloquial meaning, because I know sometimes people like to be pedantic) amongst the American right and alt-right, as the current American President's election has coincided with a revival of right-wing populism and white supremacist identity politics. No, I am not calling Trump a nazi nor am I calling all Trump supporters nazis so they can stop clutching their pearls ... that white supremacists decided to turn the populist movement that brought him into power into a narrative of racial identity and purity has been well documented, and it actually depends little whether Trump has sympathy for them, or is just their dark horse.
And that is why America is currently concerned about nazis (little n) and not communists. Because the nazis (little n) managed to meme a President into office, and the communists did not.
>It's almost like that type of political ideology took root in american institutions thus paving the way for this new narrative to take hold that communism is good and facism is bad.
There is no such "new narrative." Communism has never been trusted in the US, and fascism has always been "bad."