Flipnosis o el arte de la persuasión

I'm curious about what motivated the author to delve into the techniques of manipulation and persuasion—was it personal experience or research-driven?

Some of the strategies seemed powerful but also ethically murky. How did readers feel about the line between persuasion and manipulation?

I'm wondering if these influence methods can be used responsibly in personal or professional settings, or if they’re mostly for understanding to defend against them.