[My2Cents]

What are the odds that a pilot would dump his fuel and NOT decide to inform the tower of his decision?

OK. Try this on for size: The mechnical failure involved an electrical problem, making it impossible for the pilot to contact the tower.

The other thing I'd say is that at this point, all the details of the pre-crash events are not knowns. This lack of details is no reason to go into a "conspiracy theory" frenzy.

[copycat]

The mechnical failure involved an electrical problem, making it impossible for the pilot to contact the tower.

IMHO, you're reaching just as far as I am.