Most frustratingly, many people know how to be properly skeptical. To use Sagan's example, it comes out in full-force any time someone buys a used car. Never trust the dealer. Everybody knows that.
I really appreciate that Sagan refrains from looking down on anyone. It's all too easy to do and I am guilty of it at times. It also leads to a much more useful conversation. Sagan provides hope that we can educate better. Compared to say, Dawkins, who I think has ultimately hurt the cause. Nobody will listen when they feel insulted.
> So sad to see its worst predictions come true.
The most recent bit of the book I read involved James Randi. I was curious about the guy so I did some other reading. Randi gave out an annual "award" called the "Pigasus Award" to fraudsters and similar. Mehmet Oz received the award [1] three times. Now Oz runs Medicaid!
Sadly, we've lost Sagan and Randi. Sometimes it feels like the world has lost any sort of check against gullibility. To paraphrase from the book, many scientists are particularly not equipped to call these scammers out. Scientists wrestle with nature - nature has laws. Trying to call out the Oz's of the world is hard because they don't play by the rules of reason.
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[0] https://archive.org/details/B-001-001-709
[1] https://www.latimes.com/health/la-xpm-2011-apr-01-la-heb-dr-...