Why was there another school shooting and what do we do?

There has been another school shooting in Ateneo de Zamboanga, a grade 9 student with a high powered firearm and pistol live-streamed on Facebook, where he shot other student before ultimately taking their own life. I just wanted security is not going to fix anything. Neither is banning video games in hundreds of students go to school everyday. Do you expect security guards to be able to check every nook and cranny of every bag? They've tried upping security in the United States. It doesn't work. Unless you can get airport levels of security and private school, you cannot stop school shootings. Similarly, I don't think anyone sound of mind shooting people played a violent video game. This is an mental health and gun access. Why are 14 to 16 year olds being put in a mental state capable of doing school shootings? These children have access to guns, especially high powered ones. As bad as the school shooting was, it could have been a lot worse given the gun the kid had. So yes, let's wish those affected by the shooting well, but that's not enough. We have to hold our government accountable, ask what are we doing to stop future school shootings that will actually work? Because I think otherwise of time before school shootings.