This seems well into the realm of reactionary, and I'd love to avoid it on HN in particular. The physical and chemical worlds are absolutely chock full of things that sound terrifying, but pose no practical harm in low quantities over a human lifetime and are virtually impossible to truly 100% avoid. When you combine these two facts, you get important real-world concepts like "acceptable levels" or "acceptable durations" or exposure type distinction (e.g. inhalation vs contact).

This is the reason we don't let people who think in terms of "how many microscopic needles is it okay to have in my daughter's vagina" make legal decisions. It's the same reason we don't let victims decide the punishment for crimes.