Marathon bombing suspect Dzhokhar A. Tsarnaev is likely to avoid the death penalty, could entirely avoid a trial and in the hands of the right lawyer might win a modicum of mercy, argued top-ranked defense attorneys who have represented some of the nation’s most notorious terrorists and killers. “We know he’s 19 years old, we don’t think he has a criminal record or been in trouble before. There are a lot of people out there that seem to have warm, positive things about him,” said Tamar Birckhead, whose client, Richard Reed, tried to blow an airliner out of the sky...