In the Choruus, who or what is responsible for Haemon's confrontation?

Before Haemon confronts Creon, the Chorus mourns the tragedies of the house of Labdacus - the house that spawned Oedipus' doomed lineage. They say that madness stalks the family without fail, creating disaster for many generations like a great salt wave. They see grief falling from the beginning of the Labdacus history and that the gods continue to batter them without relief. After the confrontation the Chorus agrees that both men have a point.