The idea appears to stem from speculation of the mayor of Minneapolis. Seems like an absurd proposition to me, sounds like a weak attempt to shift attention and blame. In all likelihood, the white supremacists are at home in front of their televisions with their feet up, laughing, because the rioters are kinda doing all the heavy lifting for white supremacists. The rioters are perpetuating a stereotype, while probably motivating some whites to join the white supremacy movement. As for cartel involvement, I can't think of why they'd want to destabilize their biggest client, the U.S. population. But then, they do sell narcotics, so I suppose it wouldn't be a leap to assume that there'd be some other bad decision making involved.