I'm not proud of it now but I got suspended for throwing eggs and water bombs at a particularly vile teacher in the equivalent of 7th grade. Kids can do bad things but that's nothing new and it doesn't mean they are going to grow up as monsters. They are 8-9 years old and not exactly in full possession of their faculties.
It actually concerns me far, far more than they are treating children of that age as criminals than any stupid games they were playing.