The key point here is to identify what is being criticized by the phrase 'that's the problem.' The correct answer is C. A social therapy tactic because the sentence discusses the ineffectiveness of a tactic used for social therapy. Option A is incorrect because the settlers' approach is not mentioned in the context provided. Option B is wrong because the court's decision is not the subject of the criticism. Option D is incorrect because the butterfly hunter's method is not related to the problem stated.