Mrmph, I get the feeling that you're prolly feeling gang-banged, Eskimo.
I DO understand what you're saying. You can't let one child do something because she's an honor-student. Once you start doing that, the parents of the 'scary' kids are going to start raising heck because their child is being discriminated against. They'll point at Ms. Honor Roll and say, "But she did it, and no one said anything." and the school will be put in a bad place.
I also agree that if a teacher suspects a student to be dangerous, they need to report it. A few bad things were stopped at my highschool because a teacher took something seriously; but at the same time a few kids were put into bad light because a teacher took a jest seriously. The good outweighs the bad though, for the most part. Its unfortunate that those good kids got into trouble they weren't expecting, but in part it was their fault for joking like that when tensions were so high.
Just what bothers me about this is how the teacher had no indication that the child was going to do anything dangerous to herself or others, took the journal.. read it and then turned the girl in. Taking the journal in the first place was probably fine; I can't tell you how many times a teacher took a book away from me during classes because I wasn't paying attention or because I was distracting people with it. But reading it later was just uncalled for imho. Human nature is to be curious; she probably wanted to know what the girls were reading in class. Can't blame that; but at the same time, she /shouldn't/ have acted on the impulse to go read it.
Anyway, gonna hush up.