I wrote this for a related article yesterday: --- If we know that humans have all sorts of cognitive biases, how come it's ok to use that fact while at the same time we insist there's some kind of free market? Say you discover that putting good-looking women next to cars causes the sale of cars to increase. Why does nobody question whether it is legitimate to do so? It's as if there's a line between actively lying ("…
The point is, people don't buy things for their own sake. They buy them for what they think the thing can do for them. Any car will get you to point B, but some people will go for a cheap, utilitarian car because they want to save money (or maybe the utilitarian aesthetic is their thing), while others will go for the flashy car for that feeling of sex appeal (even if women don't suddenly fall all over a new car owner, the feeling of confidence is a social benefit to the buyer, even if that's not worth the asking price).
More generally, though, all communication has this sort of color to it. We see anti-privacy legislation being touted as protecting children and fighting crime. Small talk is not really about sports. So I don't think it's realistic to legislate persuasion. I would probably be behind making formal logic a part of public school curriculum, though, so people are better equipped to discern for themselves when persuasion they're exposed to is nonsense (among other benefits).