"don't mess with mentally unstable and/or paranoid people's minds - they're already messy enough." Which I think is a point that has lots and lots of merit.
The idea, though, is very specific. It's to inoculate these minds by telling them: look, a lot you see on the Internet originates with people who are manipulating you to their ends, and they present themselves as your friends but really aren't.
That's the basic message you need to get across re: social media.
It's the opposite messaging of what populists everywhere are getting out, be it Trumpers in the US or Querdenker in Germany, which is that the traditional media are not to be trusted (but they're actually more legally liable!). The problem is that social media is like multi-level-marketing, the last step in the distribution chain is always personal and comes with pre-existing trust.
A better and more empowering approach is the MediaWise program that teaches people to do some minimal vetting on the news they share, but to get to that point where you do that, you *have* to start questioning the information flows on the Internet, and accept that even people you trust help spread misinformation because they don't know any better.
So, messaging these people that the pastel stuff is not trustworthy would be great, if it works. If it raises awareness that "hey, I might be part of a misinformation campaign if I spread this". If they get to "yes, everyone I know is spreading this, but maybe we're being manipulated". Because *that* is actually true; that's the point of the book.
(If, to that end, you claim to know where that misinformation originates when you really don't, that's an unimportant point.)