Nothing ends with a big ol' revenge-fest. Agnes manages to get away from Gerda's fists of fury and bring Pierre Anthon back to the sawmill at long last, only to participate in his murder. The desire for revenge is justified, although, of course, the murder isn't. Everyone has lost something of major importance, only to see Pierre Anthon scoff at it. They're mad at him, they're mad at the person who made them give up whatever they gave up, and it all gets really Jerry Springer really fast. Interestingly, the aftermath of revenge is respect: after killing Pierre Anthon, they actually cry sincere tears at his funeral.
Holy Karl gets revenge on Elise by demanding that Pretty Rosa kill Cinderella. This is more important to him than having Pretty Rosa sacrifice something that's truly meaningful to her.
Eight years later, Agnes is still questioning the nature and reality of meaning, and it still makes her uncomfortable. In a way, Pierre Anthon is still getting revenge on his classmates long after his death.