what motivated bigger's choices

Bigger made many bad choices. I think his motivation was to find himself in a world where he really is relegated to a life of poverty and menial labour. Bigger thinks he has no way out. Bigger spends much of his time "messing around". He makes plans with his friends Gus, Jack, and G.H. to rob Blum’s store. Blum is a white man so they decide to bring guns and meet back up at 3 p.m. for the robbery. His choices are based on his feelings of anger and disaffection. Bigger makes a series of bad choices that eventually mean his undoing. One of the themes of the novel questions why Bigger is stuck in his downward spiral. Is it lack of hope? Is it rage or merely apathy? I think his choices relate to a combination of all of this.