On the other hand, trickling it out keeps the entire issue at the fore-front of the public's attention rather than burning out in a week and being done with it.

On the other hand, trickling it out keeps the entire issue at the fore-front of the public's attention rather than burning out in a week and being done with it. Also, as some have said, it allows those involved to come out with statements which may later be contradicted by further releases of evidence (i.e. giving the government a chance to hang themselves).