Why is the Democratic Party against the only person who could save them?

[Mister Agenda]

Like, perhaps, avoiding the two major parties until they present worthy candidates?

That might work if we avoided one of the parties, because they will change to 'get back' votes that they don't see themselves as being able to win without. If we avoid both equally, we maintain the status quo until an independent or a third party can challenge them. That's a really long game.

I tend to vote independent and 3rd party, but I live in a state that's so predictably Republican that I feel I have that luxury. Clinton lost by 10 points in SC and Johnson got less than 3 points. My vote helped a 3rd Party gain increased ballot access without helping or hurting one of the major party candidates. I'm sympathetic to a pox on both their houses. But the contrast has become far more stark than it used to be...the DNC may represent the status quo, but the GOP is sliding downhill fast.

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For one thing, he's not a Democrat. He was an independent before his presidential campaign, became a Democrat for purposes of running a campaign with a chance of winning, and returned to being an independent when it was over. From the point of view of Democrats who worked in the party for decades, the only thing he accomplished last year was to get Trump elected. I don't see why their point of view would be so mysterious.

Considering their main political message with Obama was "Change" and nothing..changed? Yeah I am a bit bewildered why they didn't and still don't understand wtf people are wanting. 

Who the people elected in the primaries is usually considered a good clue about wtf people are wanting. Bernie lost the primaries by 3 million votes and did worse in states with open primaries. I can't see through whatever crystal ball people are using to maintain that he would have won the election despite being unable to win the primaries.