"Anyone who'd sell out a whole town wouldn't hesitate to double-cross one man"

This quote by Arnold Rothstein implies that someone who is willing to betray an entire town would not hesitate about betraying a person. This suggests that the individual in question is not to be trusted and is willing to do whatever it takes to get what they want, no matter who they hurt in the process. This quote could be analyzed as a cautioning to be wary of those who are willing to do whatever it requires to get what they desire, as they may not be trustworthy. It could likewise be translated as a suggestion to be careful when dealing with individuals who have a history of betraying others, as they may want to do the very same to you. Ultimately, this quote acts as a tip to be mindful when handling those who have a history of betraying others, as they may not be reliable.