It's way more complicated than that. You have to study the history of the KKK, why it was formed, how it changed over the years with different goals. KKK in the 1920s was very popular in the West and the North, was anti-immigrant. Reconstruction KKK, Redshirts, and other groups were a reaction to Civil War vets not being able to vote or hold office, see carpetbaggers. There was also a lesser rise in KKK activity in response to Civil Rights. But that has nothing to do with Confecerate memorials.