Who in their right mind would build a concrete wall at end of a runway, to suddenly stop runaway aircraft with failed landing gear?
On many steep roads they have sand filled exits for runaway trucks with failing brakes. Why there was no such facility when a concrete wall was built to suddenly end the runway?
This was as stupid as the nuclear power plant in Japan where they had placed cooling fluid circulating pumps on top of the reactors. When the nuclear reactor has a meltdown, the pumps get melted down first! That is the problem with engineers. Any one can design anything. In medical field no one can prescribe a simple aspirin without a MD degree.
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The Japanese nuclear power plant failure was due to placement of the diesel tanks that were there to run the backup generators in case of power failure. They, unfortunately placed the fuel tanks outside the perimeter wall instead of inside as designed, and the tsunami washed them away. Without power the meltdown occurred.