Some serious, non-rhetorical (that is not just trying to criticize nut-allergy policies) questions:

• Do people with nut allergies try to insure that the airplane they board will not have any leftover nut crumbs from previous passengers (we all know how thorough airplane cleaning can be)?
• Do people with nut allergies check to be sure there are no nuts present, and will be none pulled out by someone, before entering a restaurant, public bus, private tour bus, taxi, airport membership lounge (any of which may be enclosed and air-conditioned with recycled air) or any enclosed climate-controlled building?
• Do people with nut allergies demand nut-free policies in their work places?