Here's Richard Feynman's review of the Challenger disaster: http://www.ranum.com/security/computer_security/editorials/dumb/feynman.html
Here's the report of the Columbia Accident Investigation Board: http://caib.nasa.gov/
The root causes are exactly the same. People in decision making roles totally unqualified to understand risks, no accountability. With sadly predictable effects.
With Challenger, the o-ring erosion was ignored despite the fact that they were never designed to erode.
With Columbia, the foam falling off was ignored despite the fact that it was never designed to fall off.
In both cases, it's the same fundamental problem.
So do yourself a favor and learn some critical thinking before making an ass of yourself.