It's fiction. It's not really harmful unless it's bieng glorified in a way that suggest something like, I dunno, capitalism/feudalism/etc > communism. Even then, I'm very against censorship and seeing as though we're dealing with worlds where there's fire breathing dragons, or a million clones of Buck Rogers, the concept that capitism can be a good thing seems to fit in just perfectly; i.e. an entertaining piece of fiction.
edit: Just thought of somethign else too. The very nature of RPG progression is that it's supposed to be an uphill struggle. Having an abundance of everything you could possibly ever need from the start of the game, like a character in a communist world would, would be just a little pointless dont you think?
GM: "You wake up in utopia. Everything you possibly ever will need is already provided for you. There is no crime. There is no exploitation. Everyone is happy"
Player: "... so what should my hero do?"
GM: "Well, you can go to work and produce for society, or pick up some groceries, or watch TV, or..."
Player: "... FIGHT CRIME AND OPPRESSION?"
GM: "Nah. The revolutionaries already sorted that."
Player: "Damn. Where else am I going to get a sword of light +1"
GM: "They're freely available and abundant. Do you want one?"
Player: "Anyone to fight with it?"
GM: "No"
hehehe. I think utopia is a poor setting for a RPG
