Agree pretty much with what you wrote, but you overlook the main point here that animates Bernie Supporters (like me): Bernie Sanders, for the last year and a half (most recently validated on August 25, 2017 in a national poll) has easily been (by more than 10 percentage points) the most popular politician in America and could easily have been elected President of the United States if the Democrat National Committee were actually interested in promoting the interests of the citizenry – which they currently are not.
The Democratic party is interested in electing for president someone who will promote the interests of Democratic Party MACHINE, whose interest are different than the interest of the citizenry of the United States. Every incoming president appoints 4,000 members of his/her administration, 1,200 of which require senate approval. THIS IS THE BIG PRIZE OF WINNING THE ELECTION. These people all interpret the laws of the land and make policy. As you can see from Trump, they have the power so start and continue wars, stop immigration, reverse interpretation of environmental rules, withdraw from treaties, and on and on.
Since the DNC is owned by corporate America (as administered by Clinton), the people’s interests are not counted as important as those of corporate America, which includes the health care industry, the wall street upward income redistribution industry and the gigantic warfare promotion industries. The problem is not so much that the DNC actively promoted Clinton (because Bernie was probably going to lose after the first round of primaries locked up the south for Clinton – since Clinton never really stumbled in the Democratic Primary race) but because of the back-room deals years before the election wherein the DNC decided to promote Clinton as THE candidate for president in 2017. There was plenty of malfeasance in the DNC and Democratic party in its insider support of Clinton via Debbie Wasserman Shultz and Donna Brazile, but the courts ruled in August 2017 that this type of thing is not illegal.
And your last comment that “This stuff about the DNC . . . [has] little to do with the outcome of the election” just plain misses the forest for the trees – it is exactly the DNC’s insistence on insider selection of Corporate Candidate Clinton in the year before the primary cycle that meant we democrats get don’t to have broad conversation about issues that Americans really care about – like health care, $15/hr. minimum wage, ending budget-busting wars, wall street legal reform, and is exactly why we end up losing the election to a man who reminds everyone of a cross between P.T. Barnum, a boxing match promoter and Scrooge.
And what you get when you don’t fight against the oligarchs is Trump Scrooge as president whose unabashed emphasis now (via the proposed new tax policies) of taking from the poor and giving to the rich by giving gigantic tax breaks to Corporations which means wealth goes directly to the 1% via their stock holdings and away from the 99%.