I think there was only one Democrat who stood up and was honest enough to say, "We didn't cater to our most loyal base and that's why we lost." The rest are too busy blaming things like the Russians tricking blacks or some other such garbage. If you keep on trotting out the same losing candidate who blacks don't have a great history with and you completely ignore blacks when they played a huge part in delivering you the last two elections, then you have to take self accountability when blacks don't show up.
A lot of people are tired of hearing about all the promises. Chicago is Obama's home turf and a Democrat stronghold, yet blacks there are doing awful. I think most blacks can look outside their window and see that despite all this voting, their circumstance isn't improving much. I think the blacks in Flint Michigan are still wondering why their water is messed up and why their allies the Democrats haven't come and fixed things up. Most blacks only have to look at their everyday life for one to understand why they aren't rushing out to vote.