Why do cyberattacks elevate perceptions of threat even as they fail to generate truly destructive effects? We argue that people employ motivated reasoning to align cyberattacks with their preconceptions. Fielding a two-wave panel survey immediately before and after a cyberattack on an Israeli hospital, we confirm that motivated reasoning plays a crucial role in how people interpret cyber events. Results show that people already predisposed to perceive cyberattacks as threatening experience a significant increase in perceptions of threat, while those initially viewing cyberattacks as harmless also have their beliefs reinforced. The data reveals how even minor incidents bolster cyber doom convictions.