Clinging on to that was the cold war mentality. To hold on to the world before 1917 and the rise of communism. To refuse compromise with the left and to idealize the world that existed before it and before modernization. Most anti-communist sentiment was started in the 1920's in both the US and Germany as well as other countries. In Germany the anti-communists won with the Nazi party while in the US the 'America first' anti-communist party lost to FDR's new deal which was build on compromises with communists. The success of the New Deal should have discredit aggressive anti-communist sentiment since it proved all their doom scenario's were untrue. However the US federal government alongside several megacorps especially general electric continued to fund and promote it anyway. The federal government as a means of cold war propaganda and the megacorps to try to still discredit the idea of compromise with communism.
So the republican party is a party build around clinging onto a past that was in turn build on clinging on to an even earlier past. It's not that surprising it doesn't make a lot of sense.