There are probably NA members or supporters who are as crazy/dangerous as anyone in the KKK, but I'll wager that even an NA loon is smarter than anyone in the KKK.
BTW my grandfather was a member of the KKK back when it was cool to be so, but although he's still a racist, even he admits that the current KKK are nothing but a bunch of ignorant white trash losers.
Pre-WWII, the KKK represented entire white communities, and in fact represented a large segment of white America. As such it was not only representative, but effective (given the limitations of its rather anarchic and chaotic organization).
When southern whites backed away from any kind of violence, or activist politics to oppose "civil rights" in the 1960's, however, that was the effective end of any pretense that the KKK represented anyone but a few losers. Since then, the KKK has been toothless - which is fitting since some KKK members, in a fit of self-stereotyping, are also, literally, toothless.