MICHAEL GERSON: The world is in denial about Ebola’s true threat. “The Ebola virus has multiplied in a medium of denial. There was the initial denial that a rural disease, causing isolated outbreaks that burned out quickly, could become a sustained, urban killer. There is the (understandable) denial of patients in West Africa, who convince themselves that they have flu or malaria (the symptoms are similar to Ebola) and remain in communities. And there is the form of denial now practiced by Western governments — a misguided belief that an incremental response can get ahead of an exponentially growing threat.”