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I think the FB/CA thing is prob less about privacy than the specific fear that personal psych profiles create perfect advertising. Everyone could be made to act against their interests, not just gullible people! That this isn't already the case is a pleasant lie we tell ourselves
Seems likely that: (a) manipulating a given person into doing or believing a specific thing they weren't likely to do or believe anyway is actually still very hard, and (b) manipulating enough people by just casting a sufficiently large net works & has worked for a long time.
I think most people believe some version of (a) & (b), where (a) is true if the person isn't gullible & (b) is true as long as the target pop contains enough gullible people. But I don't think gullibility explains much. Advertisers target pops that want what they're selling.
I think people also underestimate how easy it for something to work in the sense of (b). A cool ad will cause 20% of people to look at it. Of those 20% will be interested. Of those 20% will buy something they otherwise wouldn't have.
And so it will seem like 1% of people has been influenced to do something despite themselves when really just some useful information has been passed to them and a bunch of people have been spammed.
Facebook and Google biggest manipulation is making the "Ad"/"Sponsored" unnoticeable, making many people believe the content they're seeing is organic and not ads. 50% don't even know that the ads on top of Google search aren't the best search results. https://searchenginewatch.com/2016/04/27/do-50-of-adults-really-not-recognise-ads-in-search-results/ …
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