Aubri Esters treated with compassion those whose lives many consider disposable, such as drug users she sometimes could save - and sometimes couldn’t. “I have lost a lot of friends to overdoses, many in front of my eyes,” she once said during an academic panel discussion as she pushed for safe injection facilities that could reduce risks for those coping with addiction. Informed by her own experiences using drugs and living on the streets, and fierce when necessary, she let her eloquent voice ring out in City Hall, on a state commission, and in groups advocating on behalf of those...