people can be affected in many ways from things and it could take a while to show up as an affect, so who’s to say for certain how many were affected in any way or not?
I agree with your post and just to reinforce your comment:
An important concept in toxicology has been established in the 17th century by Paracelsus, the father of modern pharmacology and toxicology: “Every substance is poison, no substance is no poison. The dose and only the dose makes the substance the poison”