Appeal to fear
According to Discovering the World through Debate, an "appeal to fear" is "A fallacious argument that occurs when an arguer uses irrelevant appeals to fear to take the focus off the arguer’s original argument" (246).
Trapp, Robert, et al. Discovering the World through Debate: A Practical Guide to Educational Debate for Debaters, Coaches, and Judges. Third Edition. New York: IDEA Press Books, 2005.