School Shooting Questions

I am writing about school shootings among high school students in the Midwest because it's an important issue than everyone can relate to since it can happen everywhere. I'm going to focus on what drives a student to commit such a crime and if there has been an increase in school shootings within the last 10 years. I'm writing for students, it doesn't matter where they go to school because a shooting can happen at any school.  I want readers to learn about the factors that push a student to kill others so others can see warning signs with their classmates. I expect to find a lot of information on the topic because there have been many articles written about shooting events. I hope to answer why a student does it and if there's been an increase and if it will only get worse from here. If I can interview a participant I think that would be most beneficial, my friends brother has been at a school while a shooting as occurred but it was at the University of Texas so it doesn't really fit my narrowed down topic.