Would you consider Henry Ford a traitor? He liked Hitler too. There were many whom at the time considered Hitler as a buffer against Communism, which was considered an even greater threat.
Hindsight is 20/20.
Henry Ford is listed as a Nazi sympathizer . . . he would likely be very comfortable in the GOP-e these days.
A very good read on these folks would be “1940: FDR, Willkie, Lindbergh, Hitler—the Election amid the Storm” by Susan Dunn.