> If the chances are so low, why is a gunless teacher considered defenceless?

b-because your are taking away their gun... huh? Again: every time you go grocery shopping a substantial number of people around you are armed. You wouldn't know it.

> Why carry a gun unless you think there is a distinct chance that it will be need to be used?

You don't carry? You just carry. Do you carry pepper spray?

> Do you think in this instance giving the teachers knives would actually make anyone feel at ease?

I'd rather they have guns ???

Now that we have that solved we can talk about actual issues.