If your “brain script” leads you to kill, you just need to be removed from society
If you accept strict determinism, the fact that killers should go to prison is one of the “biases formed by prior events” that will determine that most people won’t become killers. Which in turn determine us as individuals in a society to create and enforce justice systems.
Very back-of-envelop calculation:
The quantum scale is characterized by an action comparable to the Planck constant, hbar=6.6x10-16 eV s. A quick wikipedia search tells us that the typical electric impulse needs at least 25 mV (from -70 mV in the resting state to -55 mV in the threshold), and lasts around 1 ms, giving an action of 2.5x10-5 eV s, which is 300 billion times larger that the quantum noise.