he's pointing to a group of people in history who he feels were wronged and who deserve revenge. then he's writing them their revenge. just the act of picking which group is which is a political statement. he could've written a historical revenge fantasy where a captured confederate soldier escapes and heroically takes out half the union army. he didn't write that movie because that would've been a political statement he doesn't agree with.

not to mention all the other things you missed like, as denny pointed out, blasting scarlett o'hara. you seriously think he wrote that just for juvenile fun? how can you not see something like that as a political statement?