Great graphics online. Read more and see more: http://www.politico.com/story/2015/04/the-little-pipeline-agency-that-couldnt-117147.html#ixzz3XxMadzXw
A Lesson of the 1937 Texas School Disaster: Visualize the Danger. People with responsibility may not have the knowledge or care about precaution.
The official Court of Inquiry acknowledged a series of design, building and operations problems, and unheeded warnings, yet named no one responsible. They concluded that school officials were just "average individuals, ignorant or indifferent to the need for precautionary measures, where they cannot, in their lack of knowledge, visualize a danger or a hazard." (Court of Inquiry, 1937.)