In Florida, at least, the early primary date was Republican mischief, with a date chosen by the Republican governor. Then important issues and questions were put on the ballot, plus there were important local elections. Thousands of Democrats voted in the local elections then undervoted [chose no one] for president because they were told it wouldn't count--except for Hillary's supporters. Michigan changed the date in spite of disapproval from the Democratic Party leaders. They were also told that delegates wouldn't be seated.
Ultimately it's the voters who are hurt by bad or deliberately devious decisions at the state level. Should the voters be punished? Maybe.
The only kind of "do-over" that can be done with limited outside interference is a caucus. Primaries are invitations for more mischief, hacking, deception. It's either two new caucuses or nothing.