Not only was Joe McCarthy right, but I believe that the Democrats who vilified him KNEW he was right, but it was more important to them to preserve the legacy of FDR than to do the right thing for the country. For the country to see just what FDR had done to the nation and who he had help from in doing it would have eliminated any viability for Democrats as a party.
Ann Coulter said it perfectly in her book. They fought like cornered animals to cover up their complicity.