Dr. Stockmann: "Of course you don't, but I will tell you. A free man has no right to soil himself with filth; he has no right to behave in a way that would justify his spitting in his own face." (5.120)
To the end, the Doctor absolutely refuses to be a hypocrite. He would rather sacrifice himself and his entire family than compromise his beliefs. Is he a fool or a hero? What do you think?