Why did Albert make an apology to the Count of Monte Cristo?

The Count of Monte Cristo—really Edmond Dantès—has embarked upon a plot of revenge against those responsible for his wrongful imprisonment. One of these men is the Count de Montcerf, a.k.a. Fernand Mondego. He was the one who mailed the fateful letter that led to Dantès being sent to the grim fortress of Chateau d'If.
Ironically, Dantès is friendly with Mondego's son, the journalist Albert. But he doesn't let that get in the way of his plan to wreak terrible revenge upon his father. The Count helps to expose Mondego as a traitor who assassinated Ali Pasha, an important ally of the French. When Albert discovers that it was the Count who played the leading role in his father's public disgrace and humiliation, he is furious and challenges him to a duel. His family's honor must be restored.
When the day of the duel arrives, Albert surprises everyone by apologizing to the Count. He now knows the terrible truth about his father's betrayal of Ali Pasha. He also knows about Mondego's betrayal of Edmond Dantès. Albert actually thanks the Count for not exacting a more terrible revenge on his father. The two would-be combatants shake hands and go their separate ways. Honor has been restored without a shot being fired.