"One can't live without Rossellini," a character declares in Bernardo Bertolucci's 1964 film "Before the Revolution." Yet, almost three decades after Roberto Rossellini's death in 1977, most moviegoers in America manage to live without the Italian director, though perhaps not as happily as they might. With the vast majority of his films unavailable for home rental, the father of Italian neo-realism and Isabella Rossellini has been reduced to little more than a cinephile cult figure, a faded saint on an art house fresco. Manohla Dargis reports.