The argument we are having here is essentially a classic of philosophy: empiricism versus rationalism. You keep arguing for the former; I am arguing for the latter. It is true that molecule X may not present an observable danger to health; it is also true that it may be reasonable to believe it does present one (most obviously because we do not have thousands of generations of evolutionary adaptation to it, as is the case with both lead and GMOs).

This dichotomy underpins a difference in regulation between the USA and Europe. As mentioned already, the EU Commission applies the "precautionary principle" in its legal regime for food and chemicals. This is not "unscientific". Empiricism has been more popular in the Anglophone world, but rationalism was one of the pillars of the scientific Enlightenment.

https://eur-lex.europa.eu/EN/legal-content/glossary/precauti...