|Movie poster photo via Wikipedia|
Reality? The Klan arose during the first half of Andrew Johnson's administration, precisely because Johnson was too soft. And, as partial illustration? The Klan's leadership was first offered to Robert E. Lee, before Nathan Bedford Forrest. Lee turned it down but not on moral principles. Rather, it appears he thought such type of work was beneath him and his position in the Southern social hierarchy and caste.
I have a more detailed follow-up here on how and why Kushner is wrong on this issue. And, it's important. A lot of people will see this movie and talk more about Lincoln and his ideas and goals, and too many people already think the way Kushner does about Lincoln's Second Inaugural Address. Per that link, if we want to do the ratings game, the movie gets five stars for drama but just four for historicity. It's not that it's inaccurate, but it is incomplete in how it frames emancipation and who besides Lincoln was a "driver" of the issue, and when, why and how. (See the poll at right and cast your own vote.)