So, having read some Turtledove in my youth, it’s probably not as bad as it seems. His WorldWar series, where alien iguanas invade earth during WW2 with 21st century military weapons tech is a fun speculative sci-fi, where multiple perspective style allowed a young me insight into some of the other unexplored parts of WW2: for instance, one of my favorite characters was a young Chinese woman who, after having lost everything to first the Japanese, then the Aliens, ends up joining and leading her local Maoist rebel group against the Alien occupation of China, climbing the ranks as the series goes. Another character was a woman pilot in the Red Army, who pilots her little biplane around the eastern front until she ends up teaming up with a worn out sympathetic Wehrmacht tank commander to stop literally Otto Skorzeny from nuking Warsaw, since the partisans threw in their lot with the Aliens since everyone else in Europe treated the Jews so badly. So I suppose it’s a bit of a mixed bag, lol, but ultimately I think I can trace a decent portion of my socialist tendency to having my horizons opened thanks to his series.

His other book where the Axis won WW2 ends with Nazi Germany becoming a liberal democracy in the 2010 or something because of vibes after like Himmler dies, having carried on Hitlers legacy. He also wrote Guns of the South, a speculative sci-fi where future skinheads travel back in time and give the Confederacy AK-47s (no, really) so they stand a fighting chance, but then also as a result, become sorta but not really liberalized by General Lee being exposed to the future racist ideology and deciding that’s too racist even for him. So I think he’s just a really dedicated Lib, when it comes down to it, but that’s not exculpatory of say, that one weird book he wrote about a joint Nasa-Soviet mission to explore an alien planet, where all the yanks end up fucking and cheating on each other cause they thought it was a good idea to send 3 married couples.