My heart breaks when you have to talk to your child about a school shooting. Maybe they witnessed it, maybe they heard about it, but it's one of those moments that you're like, "I want to quit this job as a parent," but don't quit. First of all, watch your non-verbal communication, if you look anxious, they'll feel anxious. Second, it's not your job to explain why there is evil in the world, what your job is, is to tell them how to find a solution to evil. Third, get to work, organize a fundraiser, talk to them about how they can give charity, who they can write letters to, how they can help raise awareness and help others. By getting into the solution and staying out of the problem, you'll give your children the best tools that they need.