Why are spinewhack-tests not indicitive of lock strength?

I had a cheap liner lock that would pass a spine-whack test easily.
However, when steady pressure was placed on the spine of the blade by hand, it slipped right off the tang.
Crappy knife. Unsafe. And it passed the useless spine-whack "test" every time.

I threw it in the river.

Come on man! Someone is gonna cut their foot....:eek:
 
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