The paper, the
In the first act, Billing, Hovstad, Captain Horster, Petra, and Mrs. Stockmann are talking. All of them seem to be freethinkers, except for Horster, who, to the amazement of the newspapermen, does not care about politics. Petra complains about having to teach lies--which are never specified--in her classes, and Billing and Hovstad eagerly discuss radical political ideas. They begin to discuss paganism, and Mrs. Stockmann makes the younger children leave. Although Mrs. Stockmann agrees with freethinking ideas, she is anxious that her children not be exposed to them. Freethinkers, then, are enlightened members of society who hold ideas that might clash with tradition. The idea of "freethinking" also seems to refer to a set of ideas not rooted in practicality or societal pressure but in pure rational thought. This is a source of frustration to Dr. Stockmann, who sees the extent to which the thoughts of the newspapermen are not free at all.
One could say that the character of Horster is a convenience. He is an outsider who gives Dr. Stockmann a place to speak when no one else will. But Ibsen includes Horster in both the opening scene and emotional final scene, where Horster is the only non-family member, and he is repeatedly offering to help the Stockmanns in various ways. Yet he does not seem to care very much about the issues. There is little evidence that he agrees with Dr. Stockmann or that he disagrees with the mayor. Instead, he symbolizes the calm man existing outside of society.