It’s better to be an accused serial killer awaiting trial than a convicted white collar criminal under pressure to cooperate with the government. After 16 years on the run, James “Whitey’’ Bulger was captured last summer in Santa Monica and flown home to Massachusetts via private jet. The mobster turned FBI informant is being held in the Plymouth House of Correction, on charges relating to 19 murders. He is close to family and lawyers, and last summer, he was transported by helicopter to a Boston court appearance. His royal treatment, which cost taxpayers $4,500, was attributed to security concerns. Now, as the press teases out word of Bulger-penned memoirs , the notorious gangster and brother of former Senate President William M. Bulger, appears to be wooing Hollywood from his jail cell.