I've always been of the mind that releasing the Durai Report when it was written would have had no benefit to anyone. It wouldn't have changed anything in Ivalice for the better, if anything it only would have provoked another wave of violence as the church brutally suppressed it. If I was making the choice keeping it hidden until the world was ready would be the way I would go.

(We have no way of knowing any of Delita's involvement in the suppression of the report)