This passage reveals several important things here: first, it’s implied that Cole’s dad is physically abusive, as it’s only in front of the guards that his dad can’t hurt him. This suggests that Cole may be lashing out because violence is all he knows—essentially, he may be part of a cycle of violence. Then, although Cole blames his mom for never standing up for herself, it’s possible that given his own self-centeredness, he doesn’t understand that she might also be in danger of Cole’s dad and may also be a victim.