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Keys malform or shear for three reasons - 1) the center bolt was loose, or 2) the slot in the shaft or pulley was damaged, or 3) extreme excessive torque was applied. Metal doesn't 'go soft' without extreme heat applied. If that level of heat was present at that point there would first be damage to something else, way more obvious, before the key failed. In this case the pulley is softer than the key, which is softer than the crank. This is a good thing as the pulley and key are waaayyy easier to repair than the crank.
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ASE Certified Master Automotive Technician w/L1.
ASE Certified Master Medium/Heavy Truck Technician.
Certified EVT (Emergency Vehicle Technician)
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