So far it is pretty shocking.
I mean, that he apparently had a Christian wife. Was a shia muslim (fyi, sunnis are the al qaeda ones...shias are the folks who welcomed us into Iraq and Afghanistan).
These guys aren't ideologues. As of right now (subject to change), it looks like they were nutcases, like the Columbine kids. They barely lived in Chechnya. They're refugees from Tajikstan (different country, fyi).
Your need to categorize and vilify large swaths of the population is counter-productive and part of the reason why we have so much trouble finding common ground as a country.