And yes, if manufacturers were creating unnatural quantities of those and polluting the environment with them in a way our bodies couldn't handle, they'd need

And yes, if manufacturers were creating unnatural quantities of those and polluting the environment with them in a way our bodies couldn't handle, they'd need to be regulated too (some probably are). But the chemicals that naturally occur in food we've been eating for 10s or 100s of 1000s of years aren't the issue here.