You would be surprised at the different attitudes & opinions in other circles that perhaps you don't frequent.
For several reasons, both personal & professional, I come in contact with a lot of people every week. I usually just keep quiet about politics and war. It's amazing how one circle of people think so totally different than another group.
In one group, a person could say, "Bush is just after the oil" and people would laugh, like it was obviously intended as a joke.