Leaded gasoline is estimated to have killed over 100,000,000 people, reduced the collective IQ of the entire planet and permanently polluted most waterways over the course of 50-60 years, all based on lies by General Motors and some others.
The demonization of cholesterol has lead to the sickest generation in human history with the highest rates of diabetes ever recorded and a massive increase of heart disease, cancer, stroke, despite claiming to reverse these conditions. We're then told its genetic to cover the lie, as if our genes somehow changed so significantly over the last 40 years that the rates of these diseases increased orders of magnitude. We now have the lowest levels of cholesterol in human history and the highest rates of disease, yet they continue to lie.
There are analogs to this. This is not new to humanity. It's just the tip of the iceberg.