"Black Mass" does a decent job of portraying the rise and fall of Boston crime boss James "Whitey" Bulger and how he wound up as an FBI informant, but there's far more to the story. Director Joe Berlinger's 2014 documentary "Whitey: United States of America vs. James J. Bulger" — available online at Amazon and Netflix — raises a troubling and unresolved question: What if Bulger wasn't an informant? As one attorney suggests, "our federal government is more corrupt than anyone ever imagined."