It doesn't need to be consistent in order to be horrifying.
The fear is that big data tech will become radioactive.
Imagine a bus full of school kids crashes because the driver was a recovering alcoholic who fell off the wagon.
Some smart SV engineer realizes their tech spotted the driver visited AA groups regularly & his wife just left him. The algorithm knows this data makes him an excellent target audience for _new alco-energy drink!_.
It doesn't really matter if the technology is even capable of that yet, what matters is that this is the sort of outcome that adtech engineers are trying to create.