Also, I wonder how can the Democratic party can still be credible in denouncing Republicans efforts to suppress voters the right to vote when employing the exact same tactics during the primaries.
The criticisms of hypocrisy are fair, but only go so far. If they violated rules, they were rules of their own making, and not rights granted by the Constitution. Voting for a party nominee is a privilege, and if the party chose to limit the voting pool to party officials only, they could do so without violating anyone's rights. Bernie is free to run as an independent, and his supporters are free to vote for him. If the DNC somehow interfered with that, they would be doing what Republicans are accused of doing with the Voter ID laws.
That's like saying, "Lying is only a crime when you're under oath. Ergo, the party leaders are free to lie all they want and no harm, no foul."