That's shocking. It must feel like a case of knowing that this sort of thing happens, but not thinking it would happen to you personally. Paedo teachers always seem like a distant problem. I imagine this raises doubts about a lot of people. It must seem very real. I guess the optimist view is that your friends could have been subject to much worse. There isn't a high bar set for getting away from child predators. It sounds to me like there is an unused noose somewhere that could be put to good use.