There may be more to this story that what is reported. At least, some articles are neglecting to include pieces of information.
Apparently, the student in question did not simply appear in a photograph with a firearm. He also made comments to the effect of, "I might shoot this ---- up", somehow implying a kind of threat. I wish I could get more of the context of the student's statements. I'd like to better understand his intent, and how his choice of words influenced the perception of school officials and/or the NJ police.
The last thing we need in this country is a bunch of wanna-be, copy-cat, student school shooters.