The trouble is, that definition of "modern propaganda" desacribes the entire press. For example, take the FBI's use of the latest mass shootings to push for encryption backdoors - those shootings make up a tiny proportion of deaths, but we prioritize emotive stories that get large amounts of press. This has also lead to some terribly ill-conceived gun control campaigns that downplay the importance of the guns most often used to murder people.
If you only read reports of vaccine-related harms, it's easy to come to the conclusion that vaccines are a terrible mistake or even a conspiracy, because human brains aren't very good at prioritising the singular fact that vaccines have saved millions of lives over a constant stream of emotive stories. If you only read about the inconsistencies and errors in contemporary reports of the Holocaust, it's easy to come to the conclusion that the whole thing is exaggerated or an outright hoax, because it's just deeply unpleasant to think about six million corpses.
I don't need to lie to you or dictate what you believe, I just need to influence what you pay attention to; if I control your attention, I can guide you towards a conclusion and make you believe that you came to it of your own initiative.