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When a movie is called “Stronger” and its hero is a maimed survivor of the Boston Marathon bombing, certain expectations arise. Courage? Valor? Tragedy? A dash of dark comedy? A heaping helping of tenacity? Yes, and “Stronger” delivers all the above. But it does so in a way that flips the whole idea of post-9/11 hero worship upside down, in a manner as welcome as it is disturbing.

Equally disturbing: Jake Gyllenhaal, who…