Islam does not require it. Only Extremist Muslims say it is a requirement to kill Americans in general. The Koran says it is required when Islam itself is under attack, and many Muslims do not believe this. A Poll of Muslims in ME countries showed 75% did not think suicide bombing or violence against civilians to defend Islam against it's enemies was justified.This guy followed what Islam requires of him.He was mentally unstable according to his fellow mental health workers at Walter Reed.He wasn't crazyO.K. so what? So are thousands of Americans. They're not going round killing people.He was a fundamentalist Islamic believer.