For western society, ISIS is often depicted as a bogeyman hiding in the shadows, waiting to strike. Rarely do we have to contend with the possibility that our children could be seduced by its poisonous ideology. That is the ordeal faced by Liadh, a middle class Tunisian father in Mohammed Ben Attia’s Dear Son. Sadly the film is crippled by a myopia that prevents it from fully exploring its striking premise. The film’s solid first act at least takes the time to establish its protagonist. Played by the endearing Mohammed Dhrif, Liadh is your quintessential doddery dad. He fumbles for…