Having your school burglarized is really, really awful. It happened to us one year, in the kindergarten building, and it took weeks to clean up and the school lost a considerable amount of supplies - many of which were bought by the teacher. In addition, the students' work was destroyed. Technology doesn't come easily in some of these schools, and the computers were stolen or destroyed. Of course, there's also the feeling of violation that comes from having your classroom ripped apart - for both the students and the teachers. The teachers can probably hide it better but it's no less.
This school has been burglarized a LOT recently. It's really horrible. I don't have any idea how to stop it or slow it down, but my heart goes out to them. It's a horrible feeling to work as hard as you can to try to help kids only to have people steal your materials for doing that.