Hundreds of people gathered Sunday at prayer vigils and in church, in frustration and exhaustion, to mourn yet another racially-motivated attack in America — this one the killing of three Black people in Florida by a white 21-year-old man who authorities say left behind white supremacist ramblings that read like "the diary of a madman." Following services earlier in the day, about 200 people showed up at a Sunday evening vigil a block from the Dollar General store in Jacksonville where officials said Ryan Palmeter opened fire Saturday using guns he bought legally despite a past involuntary commitment for a...