I know a lot of teachers, and most are antis. Though not as rabidly anti as a lot of people on NES probably assume.
I've often asked some variation on, "So, granted, you don't like guns, don't have any experience with them, and don't trust yourself with one, but let's say you're in your classroom and there's a shooter stalking the halls. Would you rather have a gun in your hand at that point?" Only one person has ever said no, and she said it was because she knew she'd be too petrified to even use it. Or anything else.
The vast majority say, "Yes, but at every other time it would scare me." ALL of them think the gun will magically fall out somewhere. Meaning the hurdle to get over, for many of these teachers, isn't so much about the gun. It's about the storage, or the holster, or the method of carry, or whatever.