The simple answer is, lack of information.
Big bang is where all events start, if there are no events before it, then there is no scale to measure anything with. There is no distance, as we measure distance as the space between two object, and no time as time is the period between two events. If there is no distance and time, there is no space time. There are no dimensions to measure or evaluate anything with, atleast to the best of our knowledge. i.e. there is no physiscs here.
It also means, whatever happened before space and time may not be of any consequence to what happened after.
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