Ideally, children would be educated and trained better to think critically; making people harder to manipulate through emotion. But, pragmatically, yeah, marketing/propaganda strategies are useful and even necessary for progress.

Your article made me wonder if there were any theories about ethically appealing to emotion, and I found this (psychological/political) theory interesting: https://semihcakir.com/blog/the-affective-intelligence-theory/. As I understand it, it posits that when people have low anxiety, their thinking is just habitual, but when they experience anxiety, they open themselves up to new information.