When a candidate claims there might be a threat simply because it cannot be proven otherwise, which fallacy are they using?

The situation described in the question illustrates the Appeal to Ignorance fallacy. This fallacy occurs when someone asserts that a claim is true simply because it has not been proven false, or vice versa. In this case, the candidate suggests that a threat exists only because there is a lack of evidence to disprove it. The reasoning is flawed since the absence of evidence does not constitute evidence in favor of the existence of a threat; it merely highlights uncertainty.

Recognizing this fallacy is important because it demonstrates how arguments can be constructed based on a misunderstanding of evidence and reasoning. The Appeal to Ignorance can often lead to unwarranted assumptions and fears, as it capitalizes on the unknown rather than addressing facts or tangible evidence. Understanding this helps in critically evaluating claims made in debates, discussions, or media, ensuring that conclusions are based on evidence rather than mere speculation.