Two very different views on prosecuting financial fraudsters and corporate criminals: Former U.S. Attorney Preet Bharara says plausible deniability makes it all but impossible to go after high-level executives like those who caused the 2008 housing collapse and ensuing crises. Others, like journalist Jesse Eisinger and Bharara’s own SDNY predecessor (one James Comey), say effective deterrence means taking on tough cases even if there’s a risk of losing.