Was there any example of a gang even mentioned? No. Crime? It is as much crime as crawling over a fence to get some apples. No need to overblow it out of proportions. What needs to be done instead - proper, basic security measures. Main one - proper password handling by teachers, who shoud be at least at basic IT level. Secondly proper IT staff and software, not something that can be hacked with a screwdriver or Notepad. Children will play, just like pups will dig and bite until they grow up and understand. If you leave your systems blatantly insecure, it is your fault, not childrens.