A Boring Dystopia

So you're telling me if you had a food allergy and you go on vacation, you would still go buy groceries and make your own meals?

Yes, there's technically a risk for food allergies whenever you go to a restaurant, but never eating out means you miss out on a lot of life events. The doctor took precautions. They did exactly what they were supposed to. Any restaurant with a sense of food safety knows how important it is to not fuck it up, and clearly Disney skipped out on the food safety training.

Most people can't always eat at home, especially when say they are on a vacation at Disney.

Then you are assured that your food is allergen free. This is about as desperate a situation you can be in and as certain of safety as you can be.

If I had a vehicule so fast it could literally kill me, I would never drive it around other people knowing my life was potentially in the hands of some inexperienced driver who has not the slightest concern or knowledge regarding traffic laws.

I could find plenty other analogies, but you get the point... So many mundane everyday activities are life threatening in a way, you can't blame people for living...

Asking the waiter for problematic ingredients and insisting on how severe your allergy is more than enough caution taken. The fault is entirely on the restaurant. If a blind person was run over after a nearby pedestrian ensured them that it was safe to cross the street, would you blame the blind person for leaving their house alone?