Why won’t an arbitrator talk with the press outside the hearing or when the arbitration case is completed?

In private sector arbitration the arbitration process is private. But even in public sector arbitration, arbitrators do not comment on cases before them for both practical and ethical reasons. It would be improper for an arbitrator to comment on a pending (undecided) case. After the opinion and award is rendered, it is that document (which well may be private) and only that document that expresses the arbitrator’s view of the dispute.