The left are obnoxious, but at least they are recognizably American.
Now... what is it you mean by “far-left propaganda”? What does that look like? What are they espousing? Mind you, I’m right-of-center compared to East/West coasters, so I’m asking this in honest confusion...
Let's look at the BLM movement. Just showing the fact that a white person is twice more likely to be shot by the police [1] per violent crime committed [2], is of course a sure way to get their public life destroyed, no matter if it is the truth according to all factual data.
[1] https://www.theguardian.com/us-news/ng-interactive/2015/jun/...
[2] https://crime-data-explorer.fr.cloud.gov/explorer/national/u...
Basically, I'm asking you, please give me some data that shows that people have suffered consequences for denouncing actual far left propaganda. I've yet to see anything like what you describe.