Yeah but you also don't want to be the admin at a school with a bomb where there were "signs a student was creating bombs before he went ape shit". I agree with the color statement, but not addressing the issue at all can be just as bad as an overreaction.
Obviously someone thought there was a sign, even the teacher told him not to show it to anyone else outside that class. I think saying that a homemade clock isn't a sign is greatly underestimating how the news is capable of skewing things to screw people over.
I looked at the pictures. Any adult with even the slightest understanding of how a bomb must physically work--like, "have something that can actually explode"--should be so utterly certain of its purpose that your concern trolling should horrify them.