Erm as far as I was aware the TWA 800 centre fuel tank exploded because the fuel gauge in the fuel tank had wires that had corroded/worn to allow a spark, they cant find what caused the excess voltage in the normaly low voltage wiring. That i think is a little worring, but as you so kindly point out it hasn't happend since.
Also the progammes illustrated other accidents that have occured due to known faults with the operation/design of the aircraft, but due to the cost of reparing the fault they have decided it not "cost effective". After all it may only be one a/c in a fleet that crashes and the insurance would be cheaper that repairing the a/c. Thats what i believe is trying to be put accross.
I highly doubt that reading the above threads, your going to be so frightened that your going to quit your job and never fly again, but this is a real threat (be it small) that is currently happening in the industry.
I certainly am still happy to fly, but it would be nice to think the a/c we fly on are fool proof but anything humans touch are always going to be faulted.
EB