BEFORE THE PANDEMIC crashed into our lives, the opioid epidemic was well underway, but both share a legacy of pain and suffering that has yet to be absorbed and properly addressed. So it felt somehow gratifying when the Venice Film Festival awarded the Golden Lion not to any of several fall-season “contenders,” but to All the Beauty and the Bloodshed Laura Poitras’s sensitively wrought portrait of consummate survivor Nan Goldin. Taking us through Goldin’s numbing family history (her sister’s suicide, parents in furious denial, foster homes) and her many lives in New York in the late 1970s and