Or maybe we should think twice about saying things like "your kids are being killed at school". I am open to suggestions but I have never heard about a book causing mayhem in a couple of minutes.

The reason why is that people don't expect to trust books. Open a random book at the bookstore, and it's probably a story that the author made up. Twitter is the same way, but people don't realize this yet.

I don't see why authors should be held responsible for their readers' stupidity, though.