For parents and teachers of millennials and their younger siblings, Mary Wakefield's tortuous meditation on scary jihadi monsters is a tough read. "Normally plucky" British seven-year-olds are "in bits," she observes. And the main reason is that the adults in their lives have lost the capacity for rational discourse. From Prince Charles' climate apocalypticism to dinner-table rants against Donald Trump and Brexit, young Brits are imbibing their elders' angst practically by osmosis. Wakefield is dead right, of course, and not only about her own country. Overwrought grown-ups are the scariest monsters of all.