I believe in arming the right teachers. Like having air marshalls on board planes.
The USA is about 38 times larger than Israel in population. However in that poster it has about a 40 to 1 murder rate when compared to Israel. The USA’s murder ratio in their schools are slightly higher than their population ratio of Israels. Therefore despite Israel arming its teachers with military assualt rifles. Its school murders is comparable to the USA.
This could make it a hard sell. Obviously it is a matter of culture and necessity.