In the ocean of several dissidents who accumulated one night this week close to the crossing point where George Floyd was murdered, a solitary voice rose from the group. “Everyone plunk down,” it critically requested. Others ringed in — “Plunk down! Plunk down!” — chastening those, even columnists, who were delayed to consent. A couple of moments later, Tony Clark, wearing a dark face veil and a hoop with the engraving “Not today Satan,” limited…"Today’s Activism: Spontaneous, Leaderless, but Not Without Aim"