This should have included some introspection on the part of the school and/or police force involved. Instead they are digging in behind the narrative that their

This should have included some introspection on the part of the school and/or police force involved. Instead they are digging in behind the narrative that their fear was reasonable and their reaction was justifiable, and that Ahmed somehow withheld information that would have changed their mind at some point. This is classic school faculty behavior: do it our way or else. He could have 'played ball' and explained in detail the project he worked on, but he didn't. He shouldn't have to either. They can expel him or send him home, but they went further, to teach him a lesson for being 'smart'. It's clear they didn't fear the device. As others have pointed out, the school wasn't evacuated. They knew it wasn't a bomb.