I'd agree with the degradation of education system you brought up but even well educated people are prone to being nudged. In the past there was a diversity of competing news reporting. In the U.S. there has been massive consolidation in ownership of media. The sources of information are becoming fewer and the targeting of information is causing people to exist in news bubbles.
As you point out we have anit-vaxers, pizza-gate, etc. and I think this is the result of people existing in news bubbles. Curated content designed to maximize dopamine, anger, fear, etc. This makes it easier to manipulate. Think of all the people who got angry, fearful when Obama suggested having talks with Kim Jon Un and who now are happy that Trump has suggested holding talks with Kim Jon Un. People are prone to this sort of hypocrisy. They most likely aren't even aware of it.
I'm not opposed to gaining a fine-grained understanding of constituent needs as such. What I do oppose is a fine grained understanding of constituent needs so that a message can be crafted to increase the chance that a policy gets enacted when that policy has nothing to do with constituent needs. The information does not appear to being used for the good but rather for the enrichment, empowerment of well connected people.
The public at large is an informational battleground in which the victor achieves power. We are pawns in a game and the purpose is not the public good. This is dangerous if people don't realize this.