I wish we would stop inadvertently reinforcing these things.
If the goal is to reduce mass acts of violence, keeping calm and carrying on is the very best thing you can do.
Shutting down for the semester would be exactly what the perpetrator wanted. I was in a school in a mass shooting happened in our community. They cancelled class for a couple of days. Then we carried on.
First, we need to advocate for responsible reporting. If the goal is to reduce further shootings, message reporters who give name of perpetrator or title the article with body count and explain how they are reinforcing and perhaps motivating future acts.
Second, don't make this about mental health. It's not. It's a spoiled, entitled, brat having a temper tantrum because they did not get what they want. Don't sympathize or empathize with these little ****s. They should be forsaken and certainly not "idolized" through infamy. Entitled spoiled selfish little dinguses - all of them - without exception. Shame this behavior.
Third, advocate for common sense gun control. But only do this after you learn about guns, understand what AR stands for, and if federal definitions of assault rifles make any sense. Don't say inflammatory stuff. Ask for incremental changes. No sweeping policies will get through. Personally, I'd ask for a reduction of capacity first of pistols/rifles and a waiting period. Steelman the other side.
Fourth, life is dangerous. But schools continue to be extremely safe.