It seems pretty obvious to me that this situation was being treated more like a disruptive passenger issue than an actual terrorist threat of a real bomb. So more like the Minneapolis plane diverted to Wisconsin the other day because of an unruly passenger. They took everyone and their devices through screening after deplaning, and it sounds like they found the teenager who owned the device. That was the point of turning around.

They probably do have to treat it seriously just in the unlikely chance it turns out to be some mentally unstable person's way of legitimately making a terroristic threat. But it also needs to be treated similarly to a drunk and violent person who needs to be duct taped to their seat until they can get handed off to the authorities.