757 Crash / Airspeed Indicator Question

From:         JW6191A@american.edu (John Witherspoon)
Organization: The American University
Date:         19 Mar 96 00:44:05 
Followups:    1
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I don't understand why a malfunctioning airspeed indicator would
cause a 757 to crash.  At the point in the flight when the pilots
discovered that there was a discrepancy, weren't they at full-throttle
anyway?  If they weren't at maximum power, why didn't they go
to it immediately and put the nose down some when the stick started
shaking (didn't it shake for over a minute?)?

Can anybody help clue-in a non-pilot?