“Of the teachers I have known teaching my children, I would have preferred those tests to become a teacher, long before they had anything to do with a gun.” I take your point. I think the quotation that applies here is:
“Those who can, do. Those who can’t, teach.” ~From George Bernard Shaw’s Man and Superman.
For the protection of children from Mass Shootings we only need 3 or 4 competent Teachers at each school; hopefully that’s not setting too high a bar for the plan?