There was a case in US where a transport company employee got himself on a flight for the sole purpose of bringing it down, so that his family would collect life insurance money on the basis it was an "accident" (he disabled recording devices).
He managed to smuggle a spear gun on the plane and...
What makes you think black boxes haven't malfunctioned before?
There have been incidents where they have been disabled, badly damaged or partially malfunctioned.
In a modern plane like the 777, it should be dependable, but nothing is ever 100% guaranteed.
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