Bull , Hillary not getting the blind support of every single Democratic primary voter isn't some historic, unfathomable act of betrayal that no one before her ever had to face the way she and her supporters like to claim. Primary voters defecting in the general election after the guy they voted for didn't win happens in every election, Hillary is just the first candidate who uses it as an excuse and complains about it incessantly. 25% of the Hillary primary voters in 2008 voted for McCain in the general (meaning that Hillary actually did better with Bernie bros in 2016 than Obama did with Shillary voters in 2008), and Obama managed to win the election in a landslide rather than cry about all of the difficulties he faces because of

muh betrayal

.
The ty turnout for Hillary was because she was a bad candidate who didn't inspire any sort of excitement among voters. She and her supporters seem to think that her not getting 95+% of the vote from all Sanders primary voters created a huge hole she had to dig out of when getting that level of support would have been unusually high.
Also worth noting that among the people who voted for Sanders in the primary and Trump in the general, Obama has an approval rating of 20% and an overwhelming majority of them consider themselves Conservatives. They weren't voters who were ever going to support Hillary.