I, personally, think it's better to keep students in the dark.
However...
As the co-head of a student-run program, it's hard to do that. Generally our policy has been to have the Captains of the teams competing at the tournament meet beforehand, and agree on a consistent policy. At times, we've not told them whether we've won or lost or shown ballots. More recently though, we've taken a policy where we tell people whether or not we won, and delay showing the team the ballots until people have had a few days to decompress and put some distance between themselves and the tournament.
Regarding the 0-6 debate: we've had teams in our program go 0-6 (thankfully, only twice in our history, that I know of), and the most recent time this happened, I was on the sidelines coaching. The Captains of that team were telling their team the score, and they were pretty upset obviously, but rather than do some crazy "0-6 plan," they channeled their disappointment constructively, and put on a great fourth round, which they won.
I think it's far more constructive, at an educational and morale level, to get your team to put on their best performance round four and have a chance to win, rather than put on an "0-6" plan.