Ahem...
The NTSB investigation found that the origin of the fuselage rupture was the centre fuel tank. Enough of the wreckage was recovered to show clearly where the break started and how it progressed around the fuselage, resulting in the separation of the nose section.
The evidence of a missile strike would be EXTREMELY OBVIOUS if a missile had entered the fuselage.
There have been other cases of exploding fuel tanks. The Iranian air force had a 747 explode in flight and there was the Thai Airways 737 that exploded shortly before passengers were about to board.
The explosive residue found on some seats was found to have gotten there as the result of an earlier exercise training bomb sniffing dogs. If I recall correctly, it was 3 seats and they were adjoining.
This happened in 1996 and was a really big event. If it was a conspiracy, a very large number of people would have to be kept quiet - the navy personnel, those involved in the wreckage recovery and those involved in the investigation (which included both the NTSB and the FBI). There would have to be at least 500 people across these groups. Each of these people have family members and other acquaintances that would notice something funny about the person if they had suddenly become party to such a disaster.
People need to realise that things like this happen. The idea that it was shot down by a missile is just too improbable.