I have a question which I don't believe is answered: these people who knew, where they using the powder on their own babies? Because they could be due to mental

I have a question which I don't believe is answered: these people who knew, where they using the powder on their own babies? Because they could be due to mental minimization of the risks associated with the use of their own products. If they are, and they could be, then humans are more pro-ignorance than I ever thought.