I believe what people are talking about in this thread is to teach students how to handle a gun...not simply how to respond if they happen to see one. So now all teachers have to be educated themselves on how to handle a gun even if they don't want to.
I referred to teaching in general becoming missionary work these days.
Nothing I've read suggests that the class is intended to "teach students how to handle a gun" and in fact is explicity designed to "teach kids how to respond if they happen to see one."
From the original article posted: "The purpose of the program will be to promote safety and protection of children and emphasize how students should respond if they encounter a firearm,"
Teachers will not need to learn how to fire a gun to teach this class. I suspect in many places it can and will be taught effectively without an actual gun being involved at all.
Like several others have said, it's the people with an attitude of "it's not important because my kid will never encounter a gun" who are far more at risk of accidental gun injury or death than kids from households where guns are prevelant and where kids are taught appropriate safety from a very young age.
For the record, I've never held a gun in my life, and I don't suspect I ever will. That won't stop me from teaching my son to "stop, don't touch, find an adult" should he ever encounter a gun.