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It's the sheer irrationality of some of these people's beliefs that scares me.
We all have our own views about particular issues and they will differ widely, but the utter bone-headed ignorance shown by some people is frightening. Do they really believe that Obama is a socialist/Muslim/terrorist bent on America's destruction, or are they just frightened people watching the world move on without them?
I know there will always be people like that and your reaction should just be to sigh and move on in the expectation that they are in the minority and the pragmatism and common sense of your leaders will prevail. But then George W. Bush comes along and, lo, you have bone-headed ignorance at the very top of the tree as well.
Never again. Please.