"There's a difference between criminals and crooks. Crooks steal. Criminals blow some guy's brains out. I'm a crook"

Ronald Biggs is making a difference in between 2 types of crooks: crooks and wrongdoers. He is claiming that he is a scoundrel, which implies that he steals, however does not dedicate violent crimes. This quote recommends that Biggs understands the difference in between the two types of lawbreakers and is trying to distance himself from the more serious criminal activities. He is also attempting to present himself as a more considerate character, as stealing is frequently viewed as a lower criminal activity than murder. By declaring to be a crook, Biggs is attempting to portray himself as a more understanding figure, rather than a criminal who commits more severe crimes. This quote likewise suggests that Biggs understands the effects of his actions and is trying to make a difference between himself and those who commit more severe crimes. By doing so, he is trying to reveal that he is not as bad as those who devote more serious criminal offenses.