Do you believe it is more harm than good to require verifiable warnings on dangerous products?

Yes

I remember warning labels tearing my childhood friends family apart. His dad would come home late at night after reading too many labels and beat his wife while my friend hid in his room.

Labels are definitely more harmful

Labels will have a nocebo effect, so that's not unreasonable. They're also guilt inducing.

>They're also guilt inducing

That sounds like a personal problem.

Informed consumers are the basis of rational market behavior. Even libertarians tend to be on board with objective informational requirements and disclosures.