We have a large children's program at the Tenshinkai Dojo. Sensei Phong loves the little ones. I think he likes teaching them alternatives to violence before they really know what it is.
Yes children are different from adults and we need to teach them differently. yes, their bodies are still forming and we need to be careful. Yes, their minds are still forming so we have to be very aware of our modeling for them. All this is true in any aspect of working with children.
I would suggest that teachers of children read up on some developmental psychology so they have a better idea on how to "enter, blend, and redirect" children appropirately and effectively.