That greater than 90% of the fault is on the unDemocratic Party for:
Cheating via favoritism
-- See leaked e-mails for goodness sake.
-- See the antitrust lawsuit that is currently in action by pro-HRC and pro-Sanders democrats against the DNC for collusion which is against their stated rules
Nominating the weaker candidate
-- Remember that independents will be voting during the general election. Many states had closed Democratic Parties where they were ignored.
-- There were significant votes, more damaging to Sanders, that were not counted, including due to voter suppression. Even with all of that, he almost matched her popular vote.
-- He wasn't under investigation the whole time for a potential felony... He was polling better for what that matters. He was the underdog this whole time and he made it happen. He just got cheated out of the nomination.
-- She did NOT win by 3 million votes. See above. That is a total lie. Even if that is the number, if she fucken cheated, it does not matter.
Continuously disrespecting the voters that you will need when the time comes
-- See the Nevada Convention videos of how shamelessly undemocratic the Democratic Party treated the Sanders's supporters. Picking up Debbie right after she resigns! What a slap in the face of the voters. Oh yeah, the chair-throwing episode never happened...
Giving Trump the anti-TPP (pro-Worker) card when all you care about are corporate payouts to your piggy-bank of a Foundation
-- This was such a stupid move. And for what? Greed? Hubris? Now Trump will be in several of the swing states with the strong pro-Worker stance while HRC who supported NAFTA strongly (not just via Bill, but herself) gets to spit on the workers.
Nominating a bone fide criminal
-- See Clinton Cash. Enough proof to convince any reasonable person that she took foreign funds for favors under her tenure in high offices
-- Liar
-- She violated the law with her server. The FBI's evidence showed this LITERALLY. Look at the press release video as well as the congressional inquiry. The reason she was not prosecuted is because there tends to be weak history of people being prosecuted for gross negligence for this specific crime. It is STILL ILLEGAL. The DoJ has just had a trend of not prosecuting those things. They were ignoring it...
-- Just remember, that even if any other worker does the same, and gets away with it possibly, that when that person gets "administrative" punishment that HRC will never get, that would mean loss of privileges in handling classified information. That could be career ending for many people. To HRC, it means a promotion.
And less than 10% (or none maybe) is for the people who have enough self-respect not to vote for such a beast.