You're Not That Deep, Kid; No Matter What Your Momma Told You.
Last night I was reading Twitter, as one does, when I ran across one of the role-players in my feed talking about the game he was running. Apparently he was under the impression that the game he was running was actually an expression of radical truth philosophy and that in imposing that philosophy onto his players and world he was teaching them something profound. Unsurprisingly the game imploded a short while later and he was mystified. I started to talk to him about it but his feed was filled with messages from the faithful who were being supportive of him. "You just have to push it harder." "The seeds are planted and you'll see them come to fruition soon." "Your players will get the message soon." It was like looking into an abyss filled with pseudo-philosophers each manipulating the others genitals while moaning, "You're brilliant!"
It's clear that this particular Dungeon Master knew just enough to be dangerous and then fooled himself into believing that he had mastery over not only the session, but the philosophy and his players. I'm not saying that if you're players want a game with a deeper philosophical underpinning that you shouldn't go out and give it to them but when you force it on them things are often going to go off the rails and you shouldn't pretend like you didn't expect them to - Hell, you can't even keep them on the adventure's path what makes you think that you can make them take up a philosophy? Especially one like radical truth! What bothered me so much about that thread was that it was clear that the Dungeon Master hadn't considered the ramifications for not only his campaign but for his friends playing the game. Radical truth isn't a joke. It will fuck up your relationships and if you're not prepared for that consequence than you shouldn't even attempt to bring it into your role-playing games.
That's not saying that there aren't philosophies that you can go half-cocked with and come out the better for using. Communism and Utilitarianism are two political philosophies that you could easily bring along with just a loose understanding and be just fine implementing. Hell, they may even fall in love with Utilitarianism in your fantasy world since that's the only place that it can actually work.