I have driven normal cars that cut power and brake if they detect a perceived dangerous situation usually annoyingly and in error. Traction control will also cut power to prevent wheel slip regardless of pedal position.
Modern cars will auto brake if sensors detect what it thinks is an imminent collision regardless of accelerator position: https://en.wikipedia.org/wiki/Automated_emergency_braking_sy...
Traction control systems will cut power if wheel slip is detected again regardless of accelerator position: https://en.wikipedia.org/wiki/Traction_control_system
FSD is obviously very different than normal cruise control and I cannot see an argument why a system that knows its heading down a dead end street at more than double the posted speed limit would allow such and accelerator override and not apply automatic emergency braking, it makes no sense, that serves no purpose while leading to a tragic outcome.
Why?
There are plenty of videos of stuck vehicles that have a hard time due to traction control disallowing power even with full accelerator pedal, this is not a foreign concept in a modern vehicle. Here is one example, they refer to traction control as the soup nazi, no power for you! : https://www.youtube.com/watch?v=WLVae7-N_Vs
It's a feature to look for in a off road vehicle if it has a traction control disable and even ABS disable on motorcycles, this is an explicit command to disable a safety feature that typically resets when power cycled. Not sure why FSD would allow overriding an obviously unsafe situation, the operator can disable the whole thing at any time if they wish to do so and go manual with a specific on screen command rather than hitting a pedal right next to the other stop pedal with your foot resting between them otherwise.