[dark_lord]

Let's see here. If I understand some events that occurred here:
(1) A piece of debris (tank insulation) hit the wing on launch.
(2) There was no external space walk and skin inspection on this flight.
(3) They lost telemetry sensor data on from the same wing shortly before the casualty.

Before jumping on terrorism as the cause, I suggest it may just be that a bunch of tiles got loosened, on reentry they came off, and the wing started to combust at that spot, and the damage spread until the wing failed and the shuttle tumbled.

[eddie willers]

Yep.

"When you hear hoofbeats, look for horses...not zebras."