Never cracked a history book? Or maybe just totally devoid of common sense, one Klan member had a particularly insane contribution to make:
"The so-called concentration camps like Auschwitz and so forth, they say they were death camps," the man told filmmakers. "But these death camps, they gave the so-called people that were being killed cigarettes, there was coffee, there was a movie theater, a library, even a swimming pool in Auschwitz."
"It's more like a summer camp," he added.
How did he think Jews spent their time during the Holocaust, that darkest of the dark epochs of human history? "Swimming," he offered.
"And working," he added. "Because they didn't want to do any work, and what Hitler was trying to do was he was trying to teach them to work, trying to rehabilitate them, if you will."
Asked to name his source, the man he said "It's all history."
The UK television crew, on location to film America's most infamous hate group in the wake of the terrorist slaughter of nine black church goers in Charleston by white supremacist Dylann Roof in June, was predictably taken aback, particularly as the US Constitution's First Amendment protects the freedom of expression even to the unabashed racists of the KKK.
The BBC journalist pointed out that Britons can be imprisoned for comparable statements.
"In Britain, inciting racial hatred carries a possible sentence of seven years in prison," the narrator explains. "Here in the US, the First Amendment guarantees free speech. Even for blatant racism."
You can watch the trailer for the documentary here: