Don't tell me states and counties can not secure their schools. After the shooting in South Florida most of the counties in the state made important changes. In the county I live a Sheriff deputy is placed in each school. Also a "Guardian" is posted at the entrance. Most often he is a combat veteran who is retired from the military. All are trained to head straight to gun fire if it breaks out in the building. Not wait on orders. They have their orders.
Also there is one point of entry and it has video cameras monitored by security. I am not saying an incident will never break out in the county I live but it sure will not be like the one in Texas turned out. The man below is a "Guardian" in Palmetto, Florida. He is retired military, combat veteran and tested.
The U.S. sends billions over seas so that countries like Ukraine can protect their citizens. Our children deserve better and they can receive it if people would focus on the problem and not on a tool to commit the crime. And the gun is nothing but a tool used by the murderer.