I know the political activists in the schools use the "we won't do it again" tactic a lot. Psychologically it satisfies the complainer. They think "well, at least no one else will experience this." they feel they have won. But parents with more than one kid can tell you it's the same ol' same 'ol the next year. It's an effective tactic as long as you have no conscience.
All of the leftist activist groups unite on their positions. And the "Algore won" protests drew all of them out in droves.