Hi Michael:
I think your point aptly demonstrates that as teachers, we may not know why students get distracted. But it also illustrates that regardless of the reason, our job is to keep them engaged, interested, involved, and active in the learning process.
I think a good syllabus coupled with a good explanation at the very beginning of a new class goes a long way to accepatance - perhaps not agreement, but at least an understanding and a willingness to try.
Regards, Barry