If people let government decide what foods they eat and what medicines they take, their bodies will soon be in as sorry a state as are the souls of those who live under tyranny.
Thomas Jefferson
nobody is saying what people can or should eat, were talking about allergies here!
Labeling foods with their contents is NOT telling people what to eat. It is informing people what is in a food so they can CHOOSE what to eat.
As someone who reacts very unpleasantly to casein, gluten and corn, I am very grateful when companies list whether or not these things are in their products. And yes, as noted in the article about that one lady, some of us do react to traces of these things. I have to avoid things like vanilla extract because of its base being grain alcohol.
If companies don't label their products, we tend to assume they are free of our allergens. But once we've been burned, we realize that many packaged items may contain our allergens whether they say so or not. We either have to jump through a bunch of hoops to call the company and then choose whether to believe them when they say their product is allergen free, OR avoid the product altogether.
You should be happy that a company that sells you food to eat is required to tell you what is in your food so that you can make an informed choice.