depends on what you mean by always, but looking back at how this was handled re: tobacco, leaded gasoline, and climate change (pre 2000) should give you some idea.

As far as I personally can see, it's been like this for a large portion of the 1900s at least.

Galileo says, no it wasn't always like this.

Yes, things have always been this way and if you really want to see just how long, look at speeches and other “news” from Ancient Greece.

The significant difference today is how quickly and widely falsehoods can be distributed and redistributed, and how many different sources this can happen to. Pre Internet, if I started telling my friends about this thing called QAnon, how far and how quickly could it really spread? Not far and not quickly. Today however it can spread across the world in a day and be picked up by every major news outlet. It’s disturbing, and we should all be very concerned.