Would that that stuff was isolated in any one region. I haven't, to my knowledge, known any actual KKK members. But a couple of years ago an acquaintance at a camera club was mentioning that he hadn't been able to find a copy or rental of "Birth of a Nation" available.
I just thought he was interested in it as a singular historic film. Then he made it increasingly clear that he appreciated it for its inspiring message. He went on to say that he felt the KKK started as a very good thing, but admitted that it had at times gone a little too far. I "lost it", and departed from the level of civil discourse.

Sad as it is to see homes and churches burned, it would be almost a relief if this turned out to be an isolated, mentally ill person.
But the odds are so good that Bobert's first assumption was right as to the nature of the case, whether or not it was literally Klan work.