The KKK was primarily ideologically motivated - an attempt to defend a mode of production (chattel slavery) that no longer existed. The whites who were members were haunted by the ghost of a way of life that was already dead.
Black Lives Matter, on the other hand, is a grift to benefit the emerging college educated black PMC and mobilize poorer blacks to defend their interests (see Patrice Collors' real estate grift). It is firmly rooted in the prevailing mode of production, capitalism. It bears more resemblance to the Tea Party, which existed to mobilize poorer whites in defense of white middle-class interests.
Black Lives Matter, on the other hand, is a grift to benefit the emerging college educated black PMC and mobilize poorer blacks to defend their interests (see Patrice Collors' real estate grift). It is firmly rooted in the prevailing mode of production, capitalism. It bears more resemblance to the Tea Party, which existed to mobilize poorer whites in defense of white middle-class interests.