Within the realm of constitutional options, the most practical remedy I can think of would be to require that a certain number of teachers or administrators in each school be trained in the use of firearms and armed at all times. That would probably deter most school shooters. It is curious, but true, that even those killers who do not intend to survive their crimes never seem to open fire in the presence of another armed person. No one tries to shoot up a biker bar.
Except for, as Charles Johnson points out, all the deadly shootouts at biker bars.
Remember, this is a man who believes union members are all thugs who want blood and thinks teachers unions are the sole cause of failed schools.
He is now calling on those selfsame union thug teachers to be forced to carry loaded firearms and be trained in how to use them as part of their jobs.
He really is insane. Completely, mentally, totally insane.