The argument that we can't use real WW2 locations because it wouldn't be politically correct is a stretch...WW2 ended 68 years ago!
Who ever said we don't use real-world locations because it not politically correct?
Real-world locations almost always dictate that any battle be two-sided. There has been plenty of discussion regarding the game being two-sided versus three-sided, and HTC decided that there shall be three sides for gameplay.
If we had real-world locations, I would assume we would only have aircraft available that flew in those areas. So what would the fans of Japanese aircraft do if a Kursk map was up? What would German fans do if a Solomons map was up? Would everyone flock to the Allied side and have very few on the Axis side on certain maps? Would that be good for gameplay?
The AvA uses two sided maps. Special events use real-world maps. Whether to go there or not is a choice for people to make. If you limited the main arena sandbox to certain geography and planes, you no longer give people a choice of what to fly, and many will just log off or quit the game altogether.