Are you on to something? Ye. . . . No. What you failed to discern was the answer to the question, how would the DA know who would go on to commit more crime, to wit, murder, and who would not? Have you discerned that without a working crystal ball, the DA would not know who would kill and who would not. Therefore, the other person's blame was misplaced on the DA. Only if every defendant went on to kill someone would the blame be proper on the DA for offering a plea bargain and not going for the gusto. Hence, it was logical to offer sarcastically that every defendant goes on to kill someone.