When a media circus gathers around a performance, or a film,or an artwork, the eventual performance ofte n fails to equal the furor that preceded it. “That’s it?” someone ends up asking. But the opposite happened at The Death of Klinghoffer: the protest was zealous but the work emerged wiser and braver than I thought it would be. This was the most intense performance I’ve ever seen at the Met, almost a tinderbox. But the opera itself, despite its unevenness and a production which, in some respects, troubled me, is far more than invective.