4 or 5 people at the top of the DNC resigned because of saying mean things about Sanders and invitations to avante garde art shows? That's not how it works.

It really is though.

The appearance of impropriety is still important to some folks though, so when private emails (that didn't lead to rigging an election, something the DNC has no power to do anyway) that show that folks in the DNC favored one candidate over the other, they resigned.

This isn't the same thing as admitting the impossible (that the DNC somehow got HRC ~4 million more votes)