I've wondered about this. Son scorned by dad. Always second to Beau. Broken family, shit father, dead mother, dead sister, dead brother, life spinning out of control, and essentially a mule for the big man.
What better way to get back at the selfish POS who has been ruining your life since birth than to be the second-hand piece of trash that brings it all crumbling down on top of him and his mistress.