Practically every food substance can cause an allergic reaction in somebody, if you look hard enough. Where do we draw the line?
Please don't misunderstand me, freedom to eat a PB&J is not a Constitutional right. We all gave up our rights to be protected by the fire-resistant properties of asbestos, because some people got cancer from it, and I think that it was a worthwhile trade. Clearly, the peanut is not an essential in any human diet, and if there are inherent properties about peanuts (like the volatility of the oils cited in this thread) perhaps they are like the other substances we have banned that only affected a relatively few people.
But where do you draw that line?
You are so right. My son's allergic to wheat. I'm training him to read lables and not eat anything he's not sure about. If we go to a party, he's learned to be very content with a bowl of icecream or (if there's nothing he can eat) to sit quietly (without attitude) while the other children eat and I buy him icecream on our way home. He's not unhappy about it.