automatic trading based on Black-Scholes acerbated the crash != the Black Scholes model contributed to the crash

Unrelatedly, is there anything wrong with, say, a mortgage-backed security accurately priced according to a particular model, so long as the limitations of the particular model's assumptions are properly understood? This applies to any model in economics or finance. All are obviously just simplifications of reality.

The technical assumptions of a mathematical model should not be blamed for the actions of ignorant or reckless investors.