Look at it this way for a second...
Perhaps Clinton DID have this information, but the damage to the party resulting from exposing it would harm THEM as well... I’d bet that there are more than a few at the DNC and in the Democrat leadership (Pelosi, Reid, etc...) that have very dirty hands at this point. Perhaps the cost to the DNC and the party was too great in their estimation, and would tarnish them in the process? Someone also brought up blackmail - definitely wouldn’t put it past them to use that tactic as well.
Hmmmmm....Yes, you are making an excellent point.