The number might be 0.2% for just sesame, but roughly 10% of Americans have some form of allergy[0]. I'm guessing the reasoning here is to attempt to prevent "allergen creep", where the endgame would be major manufacturers throwing their hands up and listing most products as possibly containing many allergens (or, as in this case, intentionally introducing unnecessary ingredients). If this were to happen, we would expect a number approaching 10% of consumers to have a needlessly large selection of foods they couldn't reliably purchase, even if there would be negligible risk otherwise.
At that point, the usefulness of requiring the labels to begin with is considerably diminished. Having a cottage industry of "actually correctly labeled" foods because the standard labels are poorly enforced seems inefficient, IMHO.
At that point, the usefulness of requiring the labels to begin with is considerably diminished. Having a cottage industry of "actually correctly labeled" foods because the standard labels are poorly enforced seems inefficient, IMHO.
[0]https://www.foodallergy.org/resources/facts-and-statistics