People with a peanut allergy are going knowingly eat something with peanut butter in it?
Besides most places post "contains nuts" somewhere--even if it's not always easy to find.
Some people can be so severely allergic that just smelling peanuts is enough to cause a deadly throat-swelling-shut reaction.
Indeed. I have a friend that will gets hives if she's even in the same room as a peanut butter jar.