A striking lived-in central performance by Mark Wahlberg as an anti-bullying crusader lifts Reinaldo Marcus Green’s frank biographical tale of Joe Bell (B-) above its sentimental R-rated afterschool special conceits. Structurally wobbly and a touch treacly, the film about a father’s road to redemption after not doing all he could to save his gay son from abuse at the hands of his high school classmates is often quite moving and revealing. Connie Britton is wonderful as well as the family matriarch, and Reid Miller gives a sensitive portrayal of the troubled teen: fragile, flamboyant and fiery. Green tinges the threadbare story with moments of realism, poignancy and heartbreaking self-reflection; it is best in its most small and intimate moments as opposed to its large gestures. The film is superb in depicting little-seen insights into the father-son bond and showcasing what it means to be strong in your own skin, and Wahlberg nails the central role. Even when the film sometimes stumbles in storytelling, it is a well-meaning summons to travel the world with head held high. It imparts lessons the world still needs to hear.