By Brad Brooks UVALDE, Texas (Reuters) – Frank Salazar pointed down the road at the low-slung buildings of Robb Elementary School, just two blocks from his home, struggling to make sense of the massacre there less than 24 hours earlier that stunned his little Texas town. Salazar, 18, a senior at Uvalde High School, went to Robb Elementary as a child, walking to school with his cousins. Like seemingly everyone else in the town of about 15,000, he knows somebody directly affected by the killing. “This community is extremely tight, but there are many people who choose to mourn quietly, alone, and…