Roll of thunder hear my cry

No worry," Papa muttered as both of them grew quiet. Then suddenly there was a sharp explosion as if something had been struck with an angry force. "If only this leg wasn't busted!"

"Don't let Stacey hear you saying that, David," Mama cautioned softly. "You know he blames himself about your leg."

"I told the boy it wasn't his fault. He just wasn't strong enough to hold Jack."

"I know that, but still he blames himself."

Papa laughed strangely. "Ain't this something?" Them Wallaces aim a gun at my head and I get my leg broke, and by boy's blaming himself for it. Why, I feel like taking a bullwhip to all three of them Wallaces and not stopping till my arm get so tired I can't raise it one more time."

What does this passage reveal about Stacey’s character?