[fragmede]

> People who decided to put lead additives in motor fuel had no idea that they would be causing brain disorders , generations down the road.

In that case, they totally did. The people who pushed leaded gasoline knew it was dangerous, but they did it anyway! By the 1920s–30s, it was already well known in medicine that lead caused neurological damage, especially in children. Workers at DuPont and Standard Oil plants developed hallucinations, seizures, and many died. What's abhorrent was where industry executives and some government allies downplayed or suppressed evidence of the harms.