Scientists have looked at anger and violence, though, and discovered genetic variations, expressed as concentrations of a particular messenger molecule in the brain, that are both congenital and predisposing to aviolenttemper.
He was heavily into drug use, sometimes had aviolenttemper and committed burglary and eventually spent three months ina court-ordered detention and rehabilitation facility in Waco, Texas, said Denise Martin, Rawls' mother.
That number found that Moussaoui's "unstable early childhood and dysfunctional family" resulted in him leaving home at a young age, and that Moussaoui's father had aviolenttemper and abused his family.