All the employees of school districts on a witch hunt to expel and otherwise permanently punish young boys for shooting toy guns or forming their fists into the shape of a gun need to read Back to Normal. The purpose of psychologist Enrico Gnaulati’s 2013 book is to argue how ordinary childhood behavior is often misdiagnosed as ADD, ADHD, depression and autism — frequently with life-long, disturbing consequences. But along the way he raises the taboo question of whether we “label boys as mentally unstable, behaviorally unmanageable, academically underachieving, in need of special-education services, or displaying behavior warranting school suspension...