A few people can make a very big scene. It was just a line of cars that shut down the Bay Bridge between Oakland and San Francisco, stopping traffic headed in the direction of a meeting of world leaders that included US President Joe Biden and Chinese President Xi Jinping. Stopping traffic, evacuating the DNC Traffic around the convention center was already restricted so the protest probably had no effect on the Asia-Pacific Economic Cooperation summit. But grinding Bay Area traffic to a halt for a few hours allowed the small group of protesters, calling for a ceasefire in Gaza,...