The world is aghast at the story of Lashanda Armstrong, the New York woman who drowned herself and her children. But as a woman who once contemplated the very same terrible act, I feel I understand her.Lashanda Armstrong, a mother of four from upstate New York, drove her minivan into the frigid Hudson River on Tuesday, killing herself and three of her four children. There will be no birthday party this week for her daughter, Lainaina Pierre, who would have turned 1 on Wednesday. The children's grandmother "can't see them no more...can't hold them no more," as she cried to...