I never said I felt compelled to use any of these items. I was simply listing the ones that are not allowed to be operated while the plane is flying. I also don't like listening to people talk on their phone, but that's because I don't like assholes in general, tayb.
It's completely pointless to ban them. Terrorists will use them if they want to, because you are still allowed to take them onto the plane. I assume the reason they ban GPS is on the same note, they don't want terrorists knowing where the plane is at the moment. It's all pointless though, terrorists aren't going to let some warning from the flight attendant stop them.