Teachers and school violence

That's a big subject description, as different kinds of violence do happen in schools. I am interested both in the subject in general re everyday school violence, differing from place to place, and the extraordinary situations that make national and international news sites notice. Both must affect teachers in a lot of ways.

I never even considered being a teacher myself, being an only child in a family that moved a lot. I couldn't imagine my being able to handle a roomful of children. I've had quite a few teacher friends, bless'em, and many instructors who taught me that I am thankful for. I've never girded my loins and become, say, a middle school teacher, even for an hour. I've lectured at a university a couple of times, but that's a different gig: somewhat scary but not what I would think of as a big control problem, much less danger filled.

I bring this up because of an article about a teacher in Oregon who had been through a traumatic shooting threat now suing the Oregon school district for not warning her about a drill -

http://www.nbcnews.com/news/us-news/teacher-sues-oregon-elementary-school-traumatic-active-shooter-drill-n345631

I've no immediate opinion re her case; just thinking that a lot of teachers probably go through at least some violence anxiety, in the U.S., but elsewhere too.

I know all teachers aren't perfect people, but my perception is that the majority of them try hard to help children learn. Learn what is another question, probably better for another thread.

Any teachers here who want to address the matter of violence in or at schools?
It's not easy on children either..