Issuing teachers with guns would be madness.
I recall several instances at secondary school of teachers losing the rag and whacking a pupil with whatever came to hand. ( It wasn't always the culprit who got whacked )
One of my english teachers at school was Adam McNaughton who wrote and collected Glasgow street songs.
He wrote a song about belting kids the last line of which was " Take the belt aff aw the teachers, issue every wan a gun "