the problem with villifying things for the wrong reason is:
1) it shifts much needed attention away from the real causes and the very important underlying issues, allowing people to think they are eating healthy for example because they are eating cases and cases of "wholesome", "all-natural" "honey&whole-wheat" doughnuts. People who like hear their problems come from just one scapegoat source will often not act all that rationally or carefully in their substitutions, and even words like "processed", "junk foods" and "fast-foods" are very easy to just distort, misunderstand or get around.
2) Saying instead "you should exercise more, control your portions, and try to eat better" is much more clear-cut, it's exactly the root of the problem, and less likely to be dismissed or ignored regardless of clever marketing.
3) Vilifying things because they are ~probably bad in some other way anyways is generally how bad information is spread without second thoughts or remorse.
"Hey, consuming fats is probably bad for you anyways so it's ok to also blame diabetes and a bunch of other unrelated stuff on it too, despite all the evidence showing other things are responsible, tell people to never intake fat at all and push them toward carbs instead, it's a white lie for the greater good, right?"...
We know many examples of this, and it's never a good practice and has generally lead to more problems than what someone "lying and exaggerating for a good cause" intended to solve, while all it would have taken is being scientific and honest about what really causes or doesn't cause something even when they are bad in other ways.
For example, sitting on the couch watching action movies on TV all day is not the most productive activity, but it will not cause your kids to go shoot people. And people who spend all their time trying to vilify action movies do a great disservice to society by shifting attention away from real and important issues that instead -have- a direct link to this problem, like lack of good parenting, or socioeconomic and psychological support to growing teens etc.
Same for many other things people might kinda want to exaggerate out of other concerns or agendas... again, telling people their hands will get hairy and they will go blind if they spend too much time in the shower or telling them that their problems are caused by the fact that KFC is secretly using magical mutant chicken with 8 wings and no head or similar absurd lies is not the answer.
