The problem for the superdelegates is that many, if not most, of them are politicians in their own right. For example, until he had to resign, Eliot Spitzer was a superdelegate. Their own livelihoods depend on staying in the good graces of their own constituents.

A superdelegate from a state or district that voted for Obama (or vice versa) has a perfectly legal right to vote for Hillary (or vice versa). However, by doing so, he or she risks pissing off his or her own constituents, regardless of whether that ire is justified.

MI and FL are a different situation. There, the superdelegates aren't the ones making the call. It's the DNC leadership (ex: Howard Dean). The leadership doesn't have to answer to a voting constituency. The people who might get pissed off (that is, the voters in those states) have no direct say about Dean or anyone else running the DNC.

So, what doc says makes a lot of sense.