Assertions are used to stop execution when "impossible" situations are detected
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Impossible conditions. Program debugging is filled with "impossible" problems ("But that parameter can't possibly be null"). If you're lucky, the problem is detected immediately in some way you can easily diagnose. If not, the error may propagate thru the program, finally crashing, but so far from the original bug that diagnosis is difficult. Even worse, the bug may not produce visible symptoms until after it has altered permanent data. Assert statements provide an easy means to check for impossible conditions, with little or no runtime cost.
Programmer, not user problems. The purpose or asserts is to detect programming errors, and they should not be used in the case of erroneous user input or actions.
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