The remarkable courage and composure of the subject of Davis Guggenheim’s movie turns out to be both its blessing and its sticking pointDavis Guggenheim’s documentary was, the end credits tell us, “inspired by the book I Am Malala”. Inspired is right. Such is the composure and eloquence of his subject, so staggeringly self-assured yet allergic to conceit, so formidable and wise beyond almost anyone’s years, you can’t but be deeply inspired.