Their crime was one of shocking brutality. Michael Adebolajo and Michael Adebowale first ran down soldier Lee Rigby in a car, then hacked him to death in a frenzied machete and knife attack.

Confronted with gory closed-circuit TV footage, grueling witness testimony and Adebolajo's own defense that he had "no choice" in Rigby's killing, as he was "a soldier of Allah," the jury took only 90 minutes to convict both defendants of his murder.
Both men converted to Islam after growing up in Christian Nigerian families.

Adebolajo also told jurors he was against British foreign policy but did not believe his Islamic views led him onto the path he had taken.

"Even before I became Muslim, I did not agree with foreign policy," he said, then describing an early memory of watching the Iraq war on television.

"'Operation Shock and Awe' -- I saw it unfold on BBC and CNN what not, and I was disgusted, you know. It was reported as if it was praiseworthy," he said. "I knew that every one of those bombs was killing someone. I was disgusted."

Adebolajo, who is married with six children, said in his police interview, shown in court, that he didn't like blood. He maintained that he posed no threat to civilians, only to the British military because of its actions overseas. He tried to cut Rigby's head off because it was the proper method under Allah, he said.

"It brings me little joy to approach anybody and slay them. Can you believe me? I am not a man who gains enjoyment from watching horror films," he said.
http://www.cnn.com/2013/12/19/world/europe/uk-soldier-killing-profiles/

Their 'tribe'!

mgbeketoto: Their 'tribe'!

mgbeketoto: Their 'tribe'!

mgbeketoto: Their 'tribe'!

I don't think you can prove that even though it seems Nigerians are perceived as violent.
What disturbs me is that they used Islam as a back up, and I know that not all Muslims are violent.
It may be an intermix of religion, ethnic background and upbringing.