It's not even so much about the rarity of events, but the violation of Informed Consent. The fundamental assumption in modern society is that you know there are dangers and their relative frequency, so that you may make decisions based on that for you to reach a mental equilibrium of risk vs reward. Someone/something acting psuedo-randomly to violate that equilibrium to an extreme (where there are brutally less choices available due to paralysis or fatal event for an individual or group) is what people react to. They want to incorporate these semi-random events into their daily equilibrium in the form of perceived patterns. This eventually leads to more extreme views (some form of theoretical pattern that fits), in lieu of data.