“Bang! Bang!” (*1/2 out of four) was an ugly and exploitative melodrama that fires all blanks about five teenagers (Nicole Fahel, Lucas Mogerley, Jordan Knapp, and others) who rob a supermarket but soon find that it has consequences upon all of them that they never imagined. Since none of the characters are likeable, it’s hard to care about them or their plights and thus the movie. Writer-director Nicholas Joseph Cunha mashes so much unpleasantness in your face that he seems to be straining to make another “Kids” but film is low on ammunition and firepower.