WATCHING MY GRANDDAUGHTER’S GYMNASTICS CLASS                      WHILE CONGRESS DEBATES AR-15s                                    By Andrew Hidas Everything to live for, the everything stretched out before them, gamboling like lambs let loose to bound and bound in the tall grasses of spring. Parents on their phones up above, a half-eye at most diverted from Facebook, the glowing faces of their daughters lost in the jumble of limbs below. “He shot my friend that was next to me and…