If you recall, some 12 years ago almost exactly to the date, TWA Flight 800 exploded just minutes after takeoff from Kennedy Airport in New York, killing everyone on board. The cause was a spark ignited vapors in an empty center fuel tank. The FAA had previously proposed a retrofit, but as usual, the airlines whined that it cost too much so the idea was delayed. I guess the lives of 200 or so people just wasn't worth the money. And so it goes.