Guevara was a vicious, megalomaniacal sociopath who wanted to be the next Stalin or Mao. (Indeed, Stalin in his younger days was a figure very much like Guevara.) He overtly and clearly stated his desire to destroy America and to exterminate millions of Americans in the process.
Yet today he is considered to be a figure worthy of admiration by the far (20% most) left in America. Go to any college campus and you will see admiring posters and t-shirts. Even Robert Redford, one of the few leftists who actually spent tens of millions of dollars of his own money on charitable causes, made a hagiographic movie about Guevera.
The vast majority of leftists, however, know nothing about the real Guevera. All they know is the hagiography that came straight out the Cold War-era Soviet propaganda mill. Worse, they don’t even bother to question the hagiography at all. If you try to confront them about their mindless adoration, they will reflexively change the subject to some real or imagined evil of non-leftists somewhere in the world’s history. They are emotionally incapable of thinking about Guevera in anything but positive terms.
Gee, I think we’ve seen some of that recently, on this very blog.