@MM
1) kudos for pointing out the practical difficulties of citizens arrests
2) James is above all young. He is trying to think even if it goes awry at times. But he gets points from me for making the effort to think things through
3) yes, nonviolence is the most effective approach, which is why BLM and the civil rights movement have been intent on nonviolent protest. However, not all people who are angry about systemic police racism are of a similar mind. From what I've seen, there are many within the black community who feel the nonviolent approaches of MLK are useless. They're horribly wrong at a basic human level. The sniper is one, rioters are another.
3). James, saying "whites" are [insert whatever] is every bit a racist as Trump's Mexicans are rapists or the white supremacists. It is both false and also leads to a destructive failure to judge people by the content of their character and not the color of their skin
@PW, I'm not sure all white people benefit from white supremacy. First, I'd distinguish between white supremacy (a philosophy that white people are inherently superior) and white privilege ( a form of social inertia in which accumulated advantages of wealth and stereotypes cut in favor of white people). White supremacy serves only to make society odious and horrible and I'm not sure it benefits anyone since it forces the "banaficiaries" to live in a totalitarian society. White privilege does benefit white people, but even that it isn't all white people and furthermore it isn't a zero sum game. I am in no way harmed if cops treat black people with as much repeat as they do white people and don't shoot them. I might be marginally harmed by having more competition for jobs and the like,but then again a more broadly based wealth and opportunity creates more opportunity also, and a more virbrant society. Some white property are talented and hard working enough that they'd do well in either kind of society and have a marginal benefit outweighed by the losses from a white privileged society. Others don't have much accumulated wealth or status and aren't benefiting all that much from it now and would probably be in a similar situation regardless. There is a group who may be on the edge who would or might lose out in a just society if everyone enjoyed the same fair treatment.
So, it is a little more complicated than that I think
Finally, I shouldn't be surprised to see how much conservatives leap to the defense of white supremacists. Sadly, it just confirms just how foundational racism is to conservative philosophy. Usually, it's better hidden than that, but this kind of incident shines a bright light on how much neonazis are ideological cousins to the GOP