You're right but also oversimplying the problem a lot of people have. No amount of science, research and nutrition knowledge is going to help you if your problem with food is how you relate to it. Food isn't just food to people. It requires extra steps and maybe even therapy.

I'm not someone who feels things like guilt for eating certain things. I dont feel that I'm good or bad depending on what I ate. For the people that do, changing their diet is more difficult because they have this other mental component. Emotional eaters aren't going to logic their way into health without also dealing with the emotional aspect.