They way i see it is if a person has a pistol and it's on his hip and open carrying it he's not really a threat just trying to be a hard ass.
Now do I think it's stupid to open carry at all when not at a range or any where u plan to shoot yes.
If u have a cpl why cause a stur put it in a different hostler and pull your shirt over it not a big deal.
Now for the principals concern you can't really blame him for sending an email like that out to the parents just to save the phone calls he would get from parents.
Billy's dad had a gun at school today you all know that's how it would be said because kids don't know any better.
So I can't blame the email
Just my .02