As the mother of a high school student, I can only tell you that while I am relieved that this is not happening at my daughter's school, the knowledge that it could have just as likely been at her school is frightening. My heart goes out to the parents of Chardon students, who are surely horrified, frightened, and filled with worry for their own kids, and those who have been injured.
High schools today are very different from when we attended them, just one generation ago. In my daughter's school, there are security guards in place the entire time that the students are there attending class, and strict rules as to when people can be inside the building. With the ability for students to communicate via cell phones and texting, word can pass immediately to groups of people who are bound and determined to cause harm. Many schools have metal detectors to keep guns and knives out of school, but the potential for violence is always there, with the backdrop of teenage hormones to exacerbate any potential problems.