Look what I found in the landfill

If you work for the CIA and show up in Chechnya or Dagestan and try to join a radical group, you are probably going to need a pretty good reference.  They will also check up on you by calling somebody who attends your mosque in Boston.  Thus, you will have been working on your 'legend', transforming from a guy who doesn't give a shit about religion to a suddenly ultra-religious man who doesn't mind if everybody knows how extremist he is:  "Mosque Says Tamerlan Tsarnaev Had Two Outbursts In The Last Year" (my emphasis in red):

"The troublesome behavior first came in November, just before Thanksgiving, the mosque said. At a weekly prayer, a preacher gave a sermon saying it was appropriate for Muslims to celebrate American holidays. Tamerlan Tsarnaev stood up and argued that "celebration of any holiday was not allowed in the faith."

The preacher met with Tsarnaev and discussed the issue after the service.

In January, the mosque said Tsarnaev had a similar outburst.

This time, the sermon included praise for Martin Luther King Jr., and this time Tsarnaev shouted, calling the preacher a "non-believer" and "hypocrite" who was "contaminating people's minds." Congregants shouted back at him, telling him to leave, and he did."

 William Plotnikov:  "Canadian may have fought ‘jihad’ in Dagestan, but he had nothing to do with Boston bombing, father says" (my emphasis in red):

"Both were boxers and immigrants in their early 20s who suddenly became devout Muslims and left North American for Dagestan, a southern Russian republic where armed groups are fighting to impose Islamic law."

Do you think the CIA is recruiting in boxing gyms?

"3 men allegedly helped Boston bombers after attack" (my emphasis in red; in the absence of evidence that the brothers had bombs, this is getting silly and impossible to believe):

"Kadyrbayev said he placed the backpack and fireworks along with trash from the apartment into a large trash bag and threw it into a garbage bin near the men's apartment.

When the backpack was later found in a landfill last week, inside it was a UMass-Dartmouth homework assignment sheet from a class Tsarnaev was taking, the FBI said."

The FBI must think that Americans are awfully stupid.