Dallas worked for a Chicago mob when he was young. He later climbed the ladder and went from club bouncer to hitman. He has a brilliant mind disguised behind the face of a common thug.
When he was thirty he tried to turn two Chicago mobs against each other, resulting in the deaths of policemen and mobsters. A hit was placed on Dallas by the mob leaders, but he managed to survive.
While he was in hiding he ran an underground gun range. He also performed hits against drug dealers, wishing to harm the American drug trade.
After ten years in hiding, he had what Bain calls a "what am I doing with my life?" crisis. He then decided to steal a shipment of weapons and try to find a criminal crew.
What makes me a good Demoman? If I were a bad Demoman, I wouldn't be sittin' here, discussin' it with you now would I?