I know a few k-6 teachers. They are dumb.
She is an excellent teacher that cares for the kids and goes out of the way to help them learn. As a matter of fact, she gets in trouble all the time from the new liberal minded principle she has because she is TOO strict on the kids. She is one of the old fashioned teachers that actually makes the kids learn -- not give them the answers.
So speaking from personal experience, I can verify that there are indeed intelligent Elementary School teachers out out there and should not be lumped into such a blanket statement.