When authorities in Los Angeles found Timothy Dean dead in the apartment of Ed Buck, a Democratic activist and campaign donor, early Monday morning, Jasmyne Cannick was not surprised. Just six months ago, Cannick had posted a warning on Twitter that something like this might happen. “If another young, Black gay man overdoses or worse dies at Democratic donor Ed Buck’s apartment it’s going to be the fault of the sheriff’s dept and L.A. District Atty for not stopping him when they had the opportunity to,” Cannick wrote on Twitter in late July. In July 2017, Gemmel Moore, a 26-year-old...