Among other things, some tire compounds use carbon black. This is currently forbidden for road vehicles in the EU, but tires in general are “some with, some without.”
I figure there are other compounds not proven to be perfectly benign. Risk aversion is a thing, and many people are pathologically risk averse.
“Risk aversion is a thing, and many people are pathologically risk averse.”
You say “pathologically risk averse”.
Might you not have simply said: “effeminate”?