The central idea of the text is decision making during evacuation. During horrific events, people seem to have different decision making skills, making it hard to process what's going on in their surroundings. "For one thing, people have different levels of decision-making skills, with some inevitably behaving more rationally than others." While the emergency evacuation is taking place, people get worried and do almost anything just to be safe and out of harms way. Since "Simplexity" was written based on 9/11, the people that were in that situation of the building crashing and them trying to evacuate to survive in a chaotic way and not an orderly fashion wouldn't be able to escape in peace or in one order. All the people think about is getting out instead of their safety.