Well, taking this reality as a given, is it such a big surprise that if you show it to enough non-technical people (like an English teacher) in a non-tinkering setting (like an English class) someone will think it looks suspicious?
Still stuck on that, huh? Let's try this again: THE ENGLISH TEACHER ISN'T THE ONE WHO ARRESTED HIM!!!!
"stuck on it"? WTF does that mean?
It's a basic part of the story. The English teacher is the one who found it suspicious and this led to the calling of the police.
If the story aspires to be some great anti-islamophobic parable the English teacher must be the first biased islamophobe. The Pontius Pilate. The Judas.
And yet you just acknowledged it's not at all surprising a non-technical person would think the device would look suspicious. As did the engineering teacher. As did Saint Ahmed of MIT himself. As does most anyone who is not blindered to reality.