I suggest you botanize a little in early and mid 20th century TV and radio broadcasts from around the world. You will find propaganda where the presenters are literally screaming like lunatics at the listener: Telling children to turn in their parents to the secret police, calling for war - and worse. That is what the majority of the population of the world had to listen to and watch. Mass media propaganda on the airwaves fueled the 20th century wars and worst crimes against humanity in history - with millions hypnotized under its spell.
You can not compare that to online conversations that you find inconvenient. And if you didn't believe in bidirectional communication you wouldn't participate here, so I think you do believe in it.
I can absolutely compare that to online conversations as they have lead to at least one attempt to overthrow the US government and have convinced an alarming minority of armed citizens that lizard people are real and pose a threat to the children of the world. That propaganda has always existed is not in question, what you fail to address in your response is the caustic effects on society caused by the proliferation of information sources.
I apologize, but if you think those things are comparable there is no way we can have any kind of fruitful conversation. Our values and perspectives are too different.
You can not compare that to online conversations that you find inconvenient. And if you didn't believe in bidirectional communication you wouldn't participate here, so I think you do believe in it.