Several other suburban school districts have already succeeded in this to varying degrees. The reasoning is cogent enough.
Some kids have an allergy to the oil in peanuts.
Some parents have, predictably, complained. Imagine the FDA finding out that carrot sticks and hot dogs cause diphtheria. Anyway, these selfish parents say they don't see why they should have to alter their child's diet, for the worse, and inconvenience themselves just to accommodate a segment of the student body that is small by their own admission. Further, they argue that children are hard to supervise in an elementary school situation, and the rules would be useless because the little rug rats would do whatever they like anyway. The parents of the at-risk children counter that whatever inconvenience their kids' allergies cause other parents, it can't be any worse than putting them in the way of such serious harm.