Ignorance was the enemy. Lies and superstition, misinformation, disinformation. Sometimes, no information at all. Ignorance killed billions of people. Ignorance caused the Zombie War. Imagine if we had known then what we know now. Imagine if the undead virus had been as understood as, say, tuberculosis was. Imagine if the world's citizens, or at least those charged with protecting those citizens, had known exactly what they were facing. Ignorance was the real enemy, and cold, hard facts were the weapons.