Tamerlan Tsarnaev

Unfinished Business

Why are we so confused about the difference between revenge and justice? Why can’t we just admit that revenge is a moral right? Thane Rosenbaum, author of Payback, on America’s right to revenge after the Boston Marathon attacks.

EMERGING PROFILE

Forget what you know about terrorism. Christopher Dickey on the three surprising factors that contribute to creating deadly terrorists, whether they are from al Qaeda or the IRA.

Unsolved Crime

Brendan Mess, best friend of “Tam” Tsarnaev, was found with his throat slit in 2011. Michael Daly reports.

20-20 Hindsight

The FBI had good reason not to make too much of their Russian counterpart’s 2011 request to check out Tamerlan Tsarnaev, U.S. officials tell Eli Lake.

Tamerlan Tsarnaev was killed in a police shootout. His brother Dzhokhar is on the run. Caitlin Dickson reports on their Internet history—and what it says about them.