That's kind of what I mean. The kind of person who will put a child's lunch in the bin, even (especially?) if they are in a rush, is not the kind of person I think should be in the school environment.
Ah is it their lunch if they haven paid fo it? Also I think you may be going a bit far with the schools as sanctuary angle. Schools are imperfect places and seeking to shield children from all possible stress only leads to raising adults who cannot take any stress.