It seems to me that immigrating from a war-torn country would have instilled within them compassion - that is, if those who had a direct influence upon them (their parents) during their formative years modeled & taught them compassion.
I suspect that these two terrorists were exposed to hate-filled rhetoric for many years - I don't necessarily believe that they were recruited or brainwashed by an extremist Islamic group. I won't be surprised if they were instilled with hate by their own adult family members with an axe to grind against any & all governments, whether Chechen, or Russian, or US.
A person who has learned compassion DOES NOT blow up innocent civilians, DOES NOT blow up children.
These two terrorists were/are filled with hate. They learned to hate from someone. I think they learned it at home. MOO