Most teachers that I know in conservative south Georgia join in order to have access to legal services in case they are sued. While I was a member of GAE, they couldn't have told me to go to the bathroom, let alone to walk out on my students. I truly question where all this time to indoctrinate children comes into play. There is barely enough time to teach the 3 R's, but then I never had time to stand in the hall and talk to other teachers either.
One big problem with education today does have to do with the books used for instruction. The big book companies run their products by California and Texas first because they are the largest purchasers of textbooks. So the rest of the country teaches what they choose.