I agree with you with the exception of Bernie’s 2016 campaign. The head of the DNC, Debbie Wasserman-Schultz, was forced to step down after evidence was found of her deliberately favoring Hillary over Bernie prior to the primary. This came after the primary vote of course.
I agree that they didn’t really give him a fair shake in 2016…however, they thought they were representing their best interests at the time and that a “fascism” proxy would lose handily to a “socialism” proxy in Sanders. They or may not have been right, and there is a lot of debate about that and I’m honestly not sure myself what to believe. He was never a serious candidate in that race and everyone probably including his own supporters knew that. In 2020, he got much closer to securing the nomination and that is why we saw the beginning of the attacks the media will toss at any Bernie-like candidate.
I haven’t thought of it that way before, but you’re absolutely correct. There’s honestly no way to tell which is the chicken and which the egg in that scenario. Did the DNC promote Hillary because the media leaned into “socialist Bernie,” or did the DNC paint him as socialist in contrast to Hillary and the media ran with it? It’s an equally thought-provoking and nauseating concept.