I think if you were able to look at the statistical probability i.e. what is the probability a child will be “accidentally shot” versus the statistical probability a teacher with a gun will “save the day” you would know if it was a good decision or bad. Personally I think a teacher with a gun is far more likely to hit an innocent bystander. Since the larger shootings are preplanned by the killers all teachers may be doing is putting themselves first in the firing line. Fortunately, school shooting are extraordinarily rare, so empirical data may take a LONG while, let’s hope so.

P.S. since I am fortunate enough to be able to afford to send my children to where I want I can say that any school that feels “unsafe” enough to need this will definitely not be attended by my children.