Think about that for a minute.
When I was growing up, I walked around with a book in my hand and was reading every spare minute. How many kids do that today with all the distractions of TV, DVD's, and video games.
Don't you think it's a very good idea to keep electronics to a minimum (or better, eliminate them entirely in K-12) in the classroom? If the rest of their lives are consumed with spending hour upon hour blankly staring into one vdt or another, isn't it fairly clear that schools do not need to add to this problem?
Moreover, there has been an alarming trend since the 1980's of students relying upon chip technology for "the answer". Question what the computer says? Never. The computer is infallible.