To cut the question short:
Certain murderers are considered cold-blooded and empathiless. Neurologists who've studied these invidual's, mainly find damage and defiencies in the prefrontal cortex, which functions as our moral and value decision-making system, aswell as damage to other areasthat allow humans to sympathize/empathize with other humans, to be considerate and so and so forth.
Now assuming the MBTI function system is correct and corresponds with actual mental centres responsible with functions. Would a damaged invidual with an F prefrence, lapse into instinctual impulsiveness or would they be forced to use their substandard T function?.