Armed security would be the quickest and most pragmatic solution in preventing school shootings and stopping them when they happen.
There are over 100,000 public schools in the US. Each have multiple doors and many have a completely open site layout with dozens of classrooms with exterior facing doors. It would require millions of armed security which makes it neither the quickest nor most pragmatic solution. That would easily cost over $50 billion per year (1 million officers @ $50k per year). We just cut taxes. Good luck getting funding.
And let's not forget that many schools already have security and it still doesn't seem to stop them. Marjory Stoneman Douglas HS in Parkland, FL had one. Great Mills HS in Maryland had one and he shot an innocent student.
And this one, Santa Fe HS in Texas, had a school officer...the suspect shot him.
Massimus - "Trump already has democrat support."