What is a "purpose"? Something people wish something would only be used for, right? How does it relate to, what influence does it have on what something will end up being used for?
Oh you are right. Let's just end neuroscience altogether. Also computer science, aerospace, and biology in general. In fact, let's go full Amish. Wait, no. Someone might use a buggy cart to run people over.
What exactly is your new fear here?
> The synthesized clips line up with what each region is known to care about, faces for FFA, places for PPA, bodies for EBA, motion for MT, patterns for V1 / V3A, and lively social scenes for pSTS / aSTS
(STS seems to be https://en.wikipedia.org/wiki/Superior_temporal_sulcus in the temporal lobe, so I guess it's the "I sense a presence" region.)
Explain the potential to exploit strong stimulation of specific visual regions for evil. "Oh, I very much detect a face/place/body/motion/pattern/human", says the subject. What are you going to do with that, startle them?