Rabbi hasn't been to Israel lately. Teachers carry rifles over their shoulders when taking the kiddies on a field trip. I have never heard of a mass shooting in Israeli schools. In fact, I don't know if I have ever heard of a "mass" shooting in Israel. I expect that a criminal intent on killing many people with a firearm doesn't get too many rounds off before the return fire starts to air out is innards.
Last school shooting in Israel..1974...that’s when they made sure the staff was armed.