To be sure, Zika is a scary disease that can cause serious illness, birth defects or fetal death. However, there are greater health risks that people face every day, much less when they travel to the Olympics. About 40,000 people die every year on Brazil's roads. Should we ban all athletes and fans from using motorized transportation? Although theories on how people perceive risk support the idea that people are more concerned about Zika than other risks, because of its potential threat to unborn children, we've never canceled the Olympics for rubella before, which can also cause severe birth defects.