I actually think the discussion of DNC "bias" is potentially interesting, although it seems too fraught to have productive discussions about.
I think we'd all generally agree that the DNC should generally not play favorites among the candidates who want to run for the Democratic nomination.
However, I would argue that this is more or less what happened. I don't think the DNC was particularly biased against Bernie Sanders -- I think that he got as much or more support as any candidate who entered the party from outside, declared that the party was corrupt, and spent most of their time refusing to coordinate or help the party and attacking it as being rigged against him.
One aspect of this is that I think people are using the word "fair" in very strange ways. To be frank, Hillary Clinton has done much more work and preparation for her presidential campaign than Bernie Sanders did. It's unclear to me why it would be "fair" for them be have roughly equal chances to win the nomination when she put in much more effort. That strikes me as demanding special treatment! I would make the argument that Hillary's overwhelming structural advantage reflected Hillary's overwhelming investment in winning, an investment Bernie Sanders never made to the same degree.
Doesn't it seem fair that the candidate that works harder and spends more time preparing should have a better chance of winning? Isn't that how we want life to work?
The other aspect of this issue is less about Clinton and more about the party. Again, Bernie spent a lot of time attacking the DNC and the Democratic Party. It is actually very strange to me that people make the argument that it is "unfair" for the DNC to want to give less support to a candidate who explicitly attacks them. I'm unclear on why it is "fair" to argue that somebody's choices should not have consequences. The argument that people's right to fair treatment is sacrosanct regardless of their antisocial behavior comes up a lot and I don't think much of it.
If you go to a barn raising and start telling everybody that they're terrible at raising barns and need to put it in a different location, you can probably expect that you will not get much support and after a while people will start giving you less attention. That's not because they're being "unfair" towards your desires. It's because people working together on a collective good are going to be more supportive of people who contribute towards that collective good. That's how society functions.