Nathan W. Jones leads the Bay Area chapter of the Black Gun Owners Assn. But until a few years ago, he wasn't even into guns. Then the COVID-19 pandemic hit. And George Floyd was killed by Minneapolis police, sending racial justice protesters into the streets. And white supremacists trashed the U.S. Capitol in the Jan. 6 insurrection. Suddenly, it seemed as if America was on the brink. And with the Supreme Court's overturning of Roe vs. Wade on Friday, emboldening a militant array of white Christian nationalists, we clearly still are. "I had visions of mobs dragging people through the...