The hard left abandoned their party because of wikileaks. Don't shift the blame here, hard evidence came out that HRC was colluding with the DNC and the Sanders supporters weren't having that shit. So they pivoted to the other populist candidate which conveniently killed the 2nd bird (the person who cheated their guy out of the nomination) with one stone. And ironically Wisconsin (and parts of OH/PA) was the Rust belt state that tipped the election to Trump by flipping a blue stronghold state.
Hillary and her campaign only have themselves to blame. Run a corrupt-free campaign and she wins, it's that simple.
I don't buy that, mainly because most people saw through the email releases for what it was: mostly nothing.
I think the truth about the Bernie supporters abandoning her was simply what you said previously: Trump spoke to them directly in the places where they lived and where they actually beat Hillary in the primaries: PA, WI, MI.
I didn't believe that enough Bernie supporters would easily move over to a fascist, but they did, and I don't blame them for it. The dems and especially Hillary are at fault for not listening to/taking them seriously regarding their real issues. Trump wisely capitalized off of it despite what all of his advisers told him to do "Ignore those states, because she already won them." "Nah, fuck you," he said, "These guys are going to listen to what I say because she hasn't shown up at their doorstep in months! She's complacent and they'll listen."
These were the deciding voters in the end (Hillary would not have needed FL, NC, Ohio if she just won those states that she was supposed to win) and Trump shrewdly stole them away. Bully for him. Those people made up their minds about this long before wikileaks and, quite frankly, nothing about emails was going to help them get jobs.