When Samantha Power asked "Why do you think my dad was the one who died?"

From the "In the Land of the Possible/Samantha Power has the President’s ear. To what end?" by Evan Osnos in The New Yorker:

Her mother, Vera Delaney... a nephrologist... married a Dublin piano player, raconteur, dentist, and drinker named Jim Power—“a fearsomely formidable pub debater,” as the Irish Independent once put it. “I was extremely close to my father, inseparable,” Power said. “Where we hung out most of the time was the pub.” Her father expounded on the day’s papers, while she read mysteries by the light of a slot machine in the basement. Her parents’ marriage didn’t last. “My mother, in effect, started leading her own life,” Power said. At the hospital, Delaney fell in love with her boss, Edmund Bourke. Divorce was illegal in Ireland, and they wanted more opportunities in medicine, so, when Samantha was nine and her brother was five, the family moved to Pittsburgh and, later, Atlanta. Jim Power remained in Ireland. She said, “We stayed in touch, and, then, the drink, I think.” She trailed off. He died when she was fourteen. [Power's husband Cass] Sunstein recalled that, decades later, on a trip to Ireland, Power took him to visit her father’s favorite pub, where they met a woman who had worked behind the bar and remembered her dad. Others seemed to drink just as much, and Power asked, “Why do you think my dad was the one who died?” The barwoman answered simply, “It’s because you left.” Power told me, “I knew he was drinking too much. But I had no idea he was sick—he was just forty-seven, and his death was devastating.”