Blood. Guts. Violence. These are not the reasons the zombie apocalypse is such a popular point in fiction. It is the destruction of society on every level, the violation of everything we take for granted. People dying on a massive scale, then returning as monsters that need to be escaped from or destroyed. Cities brought to a halt when nobody is left to turn the wheels. Normal human beings pushed beyond their physical, mental and emotional limits. We also care because we wonder what we would do. We postulate and plan and silently rate each exit in a room for effectiveness and safety.