The same common sense thinking that means the layman would regard SDS as lethal if only given my description up to the pause, is the same thinking that causes overreactions to ionising radiation, non-ionising radiation (5G death waves), and the like. Common sense is great, but only when dealing with the commonplace - which for us ground dwelling monkeys is things that we've had hundreds and thousands of years to get used to. For more modern stuff it can fail us.
A fitting example: I once stumbled (this was when my children were in preschool/daycare) on a person claiming to be on a sort of crusade against chemicals! in the environment, especially around our children.
I decided to point out that my children were surrounded by a very
chemical chemical, Silicon dioxide. They even played in it, and were encouraged to do so by daycare staff. And we all know what hurt can come from a dioxide. Sounds chemical. Right? And silicon, that stuff that implants are made of, and bathrooms are caulked with. Gotta be LETHAL.
Anyway, I'd gotten the individual pretty worked up when I decided to pull the plug on it, and let the person know that sand is a
chemical. My honesty was not rewarded. Got more than a chuckle out of it, though.