Families of the 43 students from a rural teacher’s college abducted 10 years ago in southern Mexico marked the painful anniversary Thursday disillusioned after a decade of unfulfilled government promises. The anniversary falls just four days before the departure of President Andrés Manuel López Obrador, whose election in 2018 generated hope among the families. His administration made some early advances, established a Truth Commission and declared the disappearances a “state crime.” But when the investigation stalled without the cooperation of the military, the president closed ranks with the generals.