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I guess it's some kind of collective psychology, possible associated with the Cold War, McCarthysm etc. Republicans seem to be very concerned about the purity of ideas, they want the world to be simple and black-and-white. Obviously, they are able to notice the world is ahem, slightly more complex, but they don't get it so they stick to these simple ideas out of feeling of insecurity.
@kravietz @feld This is a bi-partisan position. The Democrats have just as much of a resistance to any socialist-ideas as the Republicans. The main difference between the two parties is which sectors of industry they prioritize over citizens.