The most disturbing scene

The reaction to the helper on set who told the gangster that his stepfather had been killed by gangsters when he was a child. The story was disturbing, and was couched with a promise that he wasn't criticizing them. But the reaction of the gangsters listening was the disturbing bit - instead of realising how upset this man was, they only considered how including his story among the others might cause logistical difficulties. You could see the heartbreak on his face. He himself said it was impossible to forget. And yet they couldn't see that he was upset about his father being murdered by their kind. It must be the definitive illustration of how people can lack of empathy.