By your "logic" hanging a picture of Galen or Hippocates on the wall would facilitate their learning of anatomy.
One does not need to flag hanging to learn about WHERE a country is; WHAT its physical geography is like; HOW its people live, etc.
OH MY GOD! You cannot seriously be making this arguement.
No, you do not need to hang a flag to learn where a counry is or how its people live. It is called a teaching aid. Flags represent and identify countries.
No wonder American public schools are a laughing stock with sentiments like this.
Good post. I guess an apt analogy would be for an anatomy teacher to display two models at the beginning of school: one depicting the female labia, and another of female breasts. No other depictions of anatomy, just those. Who could complain?