And i’m saying that if a shooter expects the teacher to be armed, the teacher is not A target, the teacher is the FIRST target. The person with the gun is now thinking “spot and shoot the teacher” not “terrify and spray the room.” Unless the teacher is someone who will remain calm and steady and has excellent marksmanship, you have just reduced the effectiveness of the teacher. If you select for defense in the unlikely effect of a school shooting - you eliminate a lot of really good teachers and reduce the effectiveness of the actual teaching.

Here is what I know about myself in a crisis - I will panic. What I do after I panic may or may not be effective, but it will not be rational. Many many times my dh has looked at me and asked “why would you do A” And all I can tell him is “because I didn’t want to do B” B being the result of what I feared would happen if I didn’t do A.