>*
I'm all for moderation but the kids I have come across in my K-12 experience, if they're not paying attention, are generally pretty bored out of their minds with whatever else is going on in the classroom. Which begs the question; whose fault could that possibly be? The child's or the adult in the room?*
Well, the kids are supposed to learn things, not to be entertained.
Sometimes the two can coincide, and it's great and inspiring when it does, but the idea that learning must be an entertaining activity only does a disservice to learning, and hampers the progress of the learners. Sometimes it's just hard practice with no fun, and it's done for the sake of learning, not for giggles.