I'm inclined to agree, which is why I brought this vanity post - - to see if I was totally out to lunch. At least one person - you - seems to sense something's up with all of the emphasis on Harper Lee's book in high school, -- somethimg other than a pure commitment to literature.
My aunt used to teach AP English, and she taught TKaM. She taught in a state to the south of Alabama but thoroughly infiltrated by those darn folks from up north. She taught Faulkner, too. She loved to teach literature. Especially literature written by southerners and full of interesting characters, good and bad.