The United States already had human rights spelled out. The English already had a working concept of human rights. The French Revolution killed a bunch of people, killed the rich, killed the priests, killed the peasant, drove France into economic crisis, started wars of conquests, failed, had its leaders executed and founded an empire that started a world war killing millions. The only reasons communists like it is because a bunch of rich people were killed.
Right-wingers make it denying or distorting history a core part of their political identity, people who study or work with history therefore often don't find themselves at home in right-wing politics.