Pow pow! I struggle to get the boys, just gone three and five, to stay in their seats. The boy behind them on the bus has a toy gun and is pretending to shoot his sister, then aiming the weapon at strangers in the street outside. Pow pow pow! We never allowed our lads to play with guns. They build weapons of Lego, chew their toast into what just about resembles a pistol, and they use their hands;...