What's more open than an empty mind?They don't begin open-minded as far as I've seen. They begin arrogant, selfish and self-centered and build from there. Their whole worldview is built in petulant childishness and 'because I say so'. Their attitude toward minorities is to treat them like idiot children who can't make it in the world without a white savior, and who could never possibly be equals. The party of narcissism is not made up of people who were ever open-minded, it's made up of sociopaths.
I don't think libs are necessaily stupid, but they are ignorant, and unquestionably evil, even if not cognizant of it..., ignorant.