Lol, saruman was more or less a theocratic monarchist with highly authoritarian practices like killing any who opposed his will. He literally used magic to dominate the wills of others. If anyone was leftist in that series it was the Hobbits. They were outright Communist with no government. Though there was certainly still a class structure of sorts there. It's just tough to get a better look at Hobbit social politics. The books tend to just say "then they talked about their family history for 3 more hours" whenever it comes up.

Regardless, the stated intent of the story was to relay his experiences with war. Not with any political system. The forces of sauron and saruman just represented war itself. The feeling of its inevitable March towards you no matter how much you don't want it and dread it. It's very much how I've been feeling lately.